The Ten Plagues of Egypt, also referred to as Ten Plagues (Hebrew: עשר המכות, Eser Ha-Makot), the Plagues of Egypt (Hebrew: מכות מצרים, Makot Mitzrayim), or the Biblical Plagues, are the ten calamities imposed upon Egypt by Yahweh as recounted in the Book of Exodus, Chapters 7–12, to convince Pharaoh to let the poorly treated Israelite slaves go. Pharaoh did not permit this until after the tenth plague. The plagues were applied in a way to portray clearly the reality of Israel’s God, and by contrast the impotence of Egypt’s gods. Some commentators have associated several of the plagues with judgment on specific gods associated with the Nile, fertility and natural phenomena. According to the book of Exodus, God claims that all the gods of Egypt will be judged through the tenth and final plague:
|“||On that same night I will pass through Egypt and strike down every firstborn-both men and animals-and I will bring judgement on all the gods of Egypt. I am the LORD||”|
— Exodus 12:12 (New International Version)
The plagues as they appear in the Bible are:
The first three plagues seemed to affect "all the land of Egypt," while the 4th, 5th, 6th, 7th, and 9th did not affect the children of Israel. Conditions of the 8th plague are unclear. For the last plague the Torah indicates that they were only spared from the final plague by sacrificing the Paschal lamb, marking their doorpost with the lamb's blood, and eating the roasted sacrifice together with Matzot (לחם עוני) in a celebratory feast. The Torah describes the Angel of Death as actually passing through Egypt to kill all firstborn, but passing over (hence "Passover") houses which have the sign of lambs' blood on the doorpost. The night of this plague, Pharaoh finally relents and sends the Israelites away under their terms.
After the Israelites leave en masse, a departure known as The Exodus, Yahweh introduces himself by name and makes an exclusive covenant with the Israelites on the basis of this miraculous deliverance. The Ten Commandments encapsulate the terms of this covenant. Joshua, the successor to Moses, reminds the people of their deliverance through the plagues. According to 1 Samuel, the Philistines also knew of the plagues and feared their Author. Later, the psalmist sang of these events.
The Torah also relates God's instructions to Moses that the exodus of the Israelites from Egypt must be celebrated early on the holiday of Passover ("Pesach" פסח); the rituals observed on Passover recall the events surrounding the exodus from Egypt. The Torah additionally cites God's sparing of the Israelite firstborn as a rationale for the commandment of the redemption of the firstborn. This event is also commemorated by the fast of the firstborn on the day preceding Passover but which is traditionally not observed because a siyum celebration is held which obviates the need for a fast.
It seems that the celebration of Passover waned from time to time, since other biblical books provide references to revival of the holiday. For example, it was reinstated by Joshua at Gilgal, by Josiah,  by Hezekiah and, after the return from the captivity, by Ezra. By the time of the Second Temple it was firmly established in Israel.
The reason for the plagues appears to be at least twofold: to answer Pharaoh’s taunt, “Who is Yahweh, that I should obey his voice to let Israel go?” and to indelibly impress the Israelites with Yahweh’s power as an object lesson for all time, which was also meant to become known “throughout the world.”
According to the Torah, God hardened Pharaoh's heart so he would be strong enough to persist in his unwillingness to release the people, so that God could manifest his great power and cause it to be declared among the nations,  so that other people would discuss it for generations afterward. In this view, the plagues were punishment for the Egyptians' long abuse of the Israelites, as well as proof that the gods of Egypt were powerless by comparison. If God triumphed over the gods of Egypt, a world power at that time, then the people of God would be strengthened in their faith, although they were a small people, and would not be tempted to follow the deities that God put to shame. Exodus portrays Yahweh explaining why he did not accomplish the freedom of the Israelites immediately:
|“||I could have stretched forth My hand and stricken you [Pharaoh] and your people with pestilence, and you would have been effaced from the earth. Nevertheless I have spared you for this purpose: in order to show you My power and in order that My fame may resound throughout the world.||”|
— Exodus 9:15-16 (JPS)
The following is a summary of the Biblical account of the plagues which is found in chapters 7–12 of Exodus.
Moses and Aaron approached the Pharaoh, and to deliver God's demand that the Israelite slaves be allowed to leave Egypt so that they could worship God freely. After an initial refusal by the Pharaoh, God sent Moses and Aaron back to show him a miraculous sign of warning – Moses' staff turned into a serpent. Pharaoh's sorcerers also turned their staffs into snakes, but Moses's then proceeded to swallow theirs before turning back into a staff.
|“||This is what the LORD says: By this you will know that I am the LORD: With the staff that is in my hand I will strike the water of the Nile, and it will be changed into blood. The fish in the Nile will die, and the river will stink; the Egyptians will not be able to drink its water.||”|
— Exodus 7:17–18
The first plague was blood. God instructed Moses to tell Aaron to raise his staff over the river Nile; all of its water turned into blood. As a result of the blood, the fish of the Nile died, filling Egypt with an awful stench. Other water resources used by the Egyptians were turned to blood as well (7:19). Pharaoh's sorcerers demonstrated that they too could turn water into blood, and Pharaoh therefore made no concession to Moses' demands.
|“||This is what the great LORD says: Let my people go, so that they may worship me. If you refuse to let them go, I will plague your whole country with frogs. The Nile will teem with frogs. They will come up into your palace and your bedroom and onto your bed, into the houses of your officials and on your people, and into your ovens and kneading troughs. The frogs will go up on you and your people and all your officials.||”|
— Exodus 7:1–4
The second plague of Egypt was frogs. God commanded Moses to tell Aaron to stretch his staff over the water, and hordes of frogs came and overran Egypt. Pharaoh's sorcerers were also able to duplicate this plague with their magic. However, since they were unable to remove it, Pharaoh was forced to grant permission for the Israelites to leave so that Moses would agree to remove the frogs. To prove that the plague was actually a divine punishment, Moses let Pharaoh choose the time that it would end. Pharaoh chose the following day, and all the frogs died the next day. Nevertheless, Pharaoh rescinded his permission, and the Israelites stayed in Egypt.
|“||Then the LORD said […] "Stretch out thy rod ,and smite the dust of the land, that it may become lice throughout all the land of Egypt." […] When Aaron stretched out his hand with the staff and struck the dust of the ground, lice came upon men and animals. All the dust throughout the land of Egypt became lice.||”|
— Exodus 8:16–17
The third plague of Egypt was lice. God instructed Moses to tell Aaron to take his staff and strike at the dust, which turned into a mass of lice that the Egyptians could not get rid of. The Egyptian sorcerers declared that this act was "the finger of god" since they were unable to reproduce its effects with their magic. This plague killed the most people by far; bugs covered bodies in everyplace that you could not even touch.
|“||This is what the LORD says: Let my people go, so that they may worship me. If you do not let my people go, I will send swarms of flies on you and your officials, on your people and into your houses. The houses of the Egyptians will be full of flies, and even the ground where they are.||”|
— Exodus 8:20–21
The fourth plague of Egypt was flies, capable of harming people and livestock. The Torah emphasizes that the arov (swarm) only came against the Egyptians, and that it did not affect the Land of Goshen (where the Israelites lived). Pharaoh asked Moses to remove this plague and promised to allow the Israelites' freedom. However, after the plague was gone, Pharaoh "hardened his heart" and again refused to keep his promise.
The word עָרוֹב has caused a difference of opinion among traditional interpreters. The root meaning is related to mixing. While most traditional interpreters understand the plague as 'wild animals', Gesenius along with many modern interpreters understand the plague as a swarm of flies.
|“||This is what the LORD, the God of the Hebrews, says: "Let my people go, so that they may worship me." If you refuse to let them go and continue to hold them back, the hand of the LORD will bring a terrible plague on your livestock in the field—on your horses and donkeys and camels and on your cattle and sheep and goats.||”|
— Exodus 9:1–3
The fifth plague of Egypt was an epidemic disease which exterminated the Egyptian livestock; that is, horses, donkeys, camels, cattle, sheep and goats. The Israelites' cattle were unharmed. Once again, Pharaoh made no concessions.
|“||Then the LORD said to Moses and Aaron, "Take handfuls of soot from a furnace and have Moses toss it into the air in the presence of Pharaoh. It will become fine dust over the whole land of Egypt, and festering boils will break out on men and animals throughout the land."||”|
— Exodus 9:8–9
The sixth plague of Egypt was Shkhin. The Shkhin was a kind of skin disease, usually translated as "boils". God commanded Moses and Aaron to each take two handfuls of soot from a furnace, which Moses scattered skyward in Pharaoh's presence. The soot induced festering Shkhin eruptions on Egyptian people and livestock. The Egyptian sorcerers were afflicted alone else, and were unable to heal themselves, much less the rest of Egypt.
|“||This is what the LORD, the God of the Hebrews, says: Let my people go, so that they may worship me, or this time I will send the full force of my plagues against you and against your officials and your people, so you may know that there is no one like me in all the earth. For by now I could have stretched out my hand and struck you and your people with a plague that would have wiped you off the earth. But I have raised you up for this very purpose, that I might show you my power and that my name might be proclaimed in all the earth. You still set yourself against my people and will not let them go. Therefore, at this time tomorrow I will send the worst hailstorm that has ever fallen on Egypt, from the day it was founded till now. Give an order now to bring your livestock and everything you have in the field to a place of shelter, because the hail will fall on every man and animal that has not been brought in and is still out in the field, and they will die. […] The LORD sent thunder and hail, and lightning flashed down to the ground. So the LORD rained hail on the land of Egypt; hail fell and lightning flashed back and forth. It was the worst storm in all the land of Egypt since it had become a nation.||”|
— Exodus 9:13–24
The seventh plague of Egypt was a destructive storm. God commanded Moses to stretch his staff skyward, at which point the storm commenced. It was even more evidently supernatural than the previous plagues, a powerful shower of hail intermixed with fire. The storm heavily damaged Egyptian orchards and crops, as well as people and livestock. The storm struck all of Egypt except for the Land of Goshen. Pharaoh asked Moses to remove this plague and promised to allow the Israelites to worship God in the desert, saying "This time I have sinned; God is righteous, I and my people are wicked." As a show of God's mastery over the world, the hail stopped as soon as Moses began praying to God. However, after the storm ceased, Pharaoh again "hardened his heart" and refused to keep his promise.
|“||This is what the LORD,the God of the Hebrews, says: 'How long will you refuse to humble yourself before me? Let my people go, so that they may worship me. If you refuse to let them go, I will bring locusts into your country tomorrow. They will cover the face of the ground so that it cannot be seen. They will devour what little you have left after the hail, including every tree that is growing in your fields. They will fill your houses and those of all your officials and all the Egyptians—something neither your fathers nor your forefathers have ever seen from the day they settled in this land till now.||”|
— Exodus 10:3–6
It began day 1 of the Hebrew Month of Shevat: The eighth plague of Egypt was locusts. Before the plague, God informed Moses that from that point on He would "harden Pharaoh's heart," (as promised earlier in 4:21) so that Pharaoh would not give in, and the remaining miracles (the final plagues and the splitting of the sea) would play out.
As with previous plagues, Moses came to Pharaoh and warned him of the impending plague of locusts. Pharaoh's officials begged him to let the Israelites go rather than suffer the devastating effects of a locust-swarm, but he was still unwilling to give in. He proposed a compromise: the Israelite men would be allowed to go, while women, children and livestock would remain in Egypt. Moses repeated God's demand that every last person and animal should go, but Pharaoh refused.
God then had Moses stretch his staff over Egypt, and a wind picked up from the east. The wind continued until the following day, when it brought a locust swarm. The swarm covered the sky, casting a shadow over Egypt. It consumed all the remaining Egyptian crops, leaving no tree or plant standing. Pharaoh again asked Moses to remove this plague and promised to allow all the Israelites to worship God in the desert. As promised, God hardened Pharaoh's heart, and he did not allow the Israelites to leave.
|“||Then the LORD said to Moses, "Stretch out your hand toward the sky so that darkness will spread over Egypt—darkness that can be felt." So Moses stretched out his hand toward the sky, and total darkness covered all Egypt for three days. No one could see anyone else or leave his place for three days.||”|
— Exodus 10:21–23
In the ninth plague, God commanded Moses to stretch his hands up to the sky, to bring darkness upon Egypt. This darkness was so heavy that an Egyptian could physically feel it. It lasted for three days, during which time there was light in the homes of the Israelites. Pharaoh then called to Moses and offered to let all the Israelites leave, if only the darkness would be removed from his land. However, he required that their sheep and cattle stay. Moses refused, and went on to say that before long, Pharaoh himself would offer to provide animals for sacrifice. Pharaoh, outraged, then threatened to execute Moses if he should again appear before Pharaoh. Moses replied that he would indeed not visit the Pharaoh again.
This plague was an attack aimed directly at Pharaoh's deity Ra, the Egyptian sun god. By introducing the plague of darkness, Moses attempted to demonstrate the futility of faith in Egyptian gods.
|“||This is what the LORD says: 'About midnight I will go throughout Egypt. Every firstborn son in Egypt will die, from the firstborn son of Pharaoh, who sits on the throne, to the firstborn son of the slave girl, who is at her hand mill, and all the firstborn of the cattle as well. There will be loud wailing throughout Egypt—worse than there has ever been or ever will be again.||”|
— Exodus 11:4–6
The tenth and final plague of Egypt was the death of all Egyptian first born — no one escaped, from the lowest servant to Pharaoh's own first-born son, including first-born of livestock. Before the plague, God commanded Moses to inform all the Israelites to mark lamb's blood on the doorposts on every door in which case the LORD (Yahweh in Hebrew, not the angel of death as is commonly thought - see Exodus 12:12-13 and Exodus12:29) will pass over them, thus sparing all the Israelite first-borns. This was the hardest blow upon Egypt and the plague that finally convinced Pharaoh to submit, and let the Israelites go.
After this, Pharaoh, furious and saddened, ordered the Israelites to go away, taking whatever they wanted. The Israelites didn't hesitate; and at the end of that night Moses led them out of Egypt with "arms upraised." 
One of the noticeable features of the tales is that there appears to be an underlying pattern, the third, sixth and ninth plagues come without warning, and many biblical commentators see there as being three sets of three plagues each. Attempts to draw parallels between each have had limited success, and are somewhat disputed. Some point to Rabbi Yehuda (quoted in the Haggadah of Pesach) who implied this idea by grouping the first three, middle three and last four together with the mnemonics DE.ZA.KH. A.DA.SH. BA.A.HA.V.
Another significant feature is that some plagues, but not others, are instigated by Aaron, rather than Moses. Many critical religious commentaries resolve this situation by saying that because of the principle of Ha-karat ha-tov, Moses was obliged to appreciate the help he received earlier from the Nile, as a baby (Exodus 2:1-10), and the dust, when he murdered a guard in his youth, (Exodus 2:11–12) and was therefore unable to smite either of these.
According to the documentary hypothesis, the plagues of boils, and of lice, are merely the Priestly source's version of JE's plagues of pestilence, and of flies. The Torah is thus seen as only gaining 10 plagues when both these versions were merged together, and thus treated as separate plagues. Similar merging also allegedly explains the pattern where the third, sixth and ninth plague, come without warning, as originating from different sources to the one in which warning is provided. Likewise, in this hypothesis, one source presents Aaron as carrying out the plague, one presents Moses as their origin, and one presents God as the explicit origin, and since the plagues they each describe do not completely overlap, this provides an explanation for why Moses carries out some plagues, but Aaron carries out others. The hypothesis also breaks the account of the plagues down further.
In an historical context, the greatest candidate for the Israelite presence in Egypt is that of the Hyksos. However, rather than being slaves who escaped, the Hyksos were rulers who were chased out of Egypt. The extreme resistance, in the story, of the unnamed Pharaoh to releasing them therefore, according to such an historical-critical view, serves to provide an explanation of why an Egyptian Pharaoh so angrily chased after the Israelites.
Within the understanding of the documentary hypothesis, in the Jahwist version of the tale, Moses asks Pharaoh for the release of the people, but Pharaoh refuses, claiming not to know who Yahweh is. Consequently God sends the first plague, and Pharaoh recants, begging Moses for assistance, and immediately allowing the people to go, albeit under certain conditions. The Jahwist continues to describe Moses as insisting on the conditions, but nevertheless begging God to end the plague, which happens, but Pharaoh goes back on his word, and so God sends another plague. This pattern repeats, the Pharaoh gradually acceding to more and more conditions, until, after the death of the firstborn, Pharaoh finally accedes to all of them, even allowing the Israelites to take the ornaments of the Egyptians, begging to be blessed by Yahweh. Nevertheless, true to form, according to the Jahwist, Pharaoh goes back on his word, and chases after the released Israelites to recapture them.
By contrast, although the Elohist presents a similar set of plagues, the story is much less naturalistic. The Elohist has Moses threatening Pharaoh, and then, via his rod, carrying out each plague, until eventually he threatens to kill all the firstborn of Egypt, even giving a ritual to the Israelites so that they can cause this death to pass over their houses. At this point, the fear of Moses amongst the Egyptians reaches such a point that they are described as being insistent that the Israelites should get out of Egypt as soon as possible, before the final plague, apparently not carried out, is visited upon them. The Israelites then leave with a high hand, but are soon chased away by Pharaoh's army.
The Elohist also splits up some of the Jahwist's plagues, making them more elaborate,
While the Jahwist's presentation of the plagues is much more naturalistic, the plagues just happening, and Moses just praying that they end, it is the Elohist description of the Egyptians' motive in chasing after the Israelites that accords better with an identification of the Israelites as the Hyksos. Generally, in critical scholarship, both these versions are seen as being based on a shared tradition, rather than one taking precedence over the other, with the Elohist seeking to spin Moses as having supernatural powers and the Israelites as being chased because they are feared, rather than hated like the Hyksos.
When combined into JE, the story becomes one in which Moses threatened the plague, then made a sign at which God carries the plague out, and then is from time to time asked by Pharaoh for forgiveness, at which point the plague is undone. While the Elohist produced 8 plagues, and thus so did JE, the Jahwists conception, of there being 5 plagues, appears to have been a tradition preserved at least until the Priestly source, who, in writing their own version of JE, also chose 5 plagues, cutting out the plagues of locusts, darkness, and hail.
The Priestly source, however, completely changes the framing of the plagues. Instead of threats to Pharaoh, or punishment for which Pharaoh begs forgiveness, the plagues are presented merely as a trial to prove Yahweh's authority. Each plague is followed by the magicians attempting to duplicate the plague, succeeding on the first two, leading to Pharaoh hardening his heart. The second pair of plagues are also made more immediate and relevant to the magicians, these plagues are of lice rather than flies, and of boils rather than an unspecified pestilence, leading to the magicians being unable to perform these activities. The final plague, the death of firstborn, is also altered to appear as a punishment for the Egyptians.
The Priestly source, keen to assert God as only acting via the Aaronid priesthood, also describes Aaron as being the one instigating the plagues, starting, "And The LORD said unto Moses, Say unto Aaron", whereas it is always Moses who is involved in either carrying out, or stopping, the plagues in JE.
The Quran presents few descriptions of the plagues of Egypt, most notably
(VII.133, 136, Pickthall) "We sent them the flood and the locusts and the vermin and the frogs and the blood … therefore we drowned them in the sea: because they denied Our revelations and were heedless of them."
(XXIX, 39–40, Ali) "(Remember also) Qarun, Pharaoh and Haman: there came to them Moses with clear signs, but they behaved with insolence on the earth; yet they could not overreach (Us). Each one of them we seized for his crime: of them, against some we sent a violent tornado (with showers of stones); some we caught by a (mighty) blast; some we caused the earth to swallow up; and some we drowned (in the waters): it was not Allah who injured (and oppressed) them: they injured (and oppressed) their own souls."
Secular thinkers believe the plague stories are simply mythical or allegorical, or inspired by passed-down accounts of disconnected natural disasters. Others have speculated on possible natural inspirations behind the story of the succession of plagues.
There is archaeological material that some Christian archaeologists, such as William F. Albright, have considered historical evidence of the Ten Plagues; for example, an ancient water-trough found in El Arish bears hieroglyphic markings detailing a period of darkness. Albright, and other Christian archaeologists have claimed that such evidence, as well as careful study of the areas ostensibly traveled by the Israelites after the Exodus, make discounting the biblical account untenable. The Egyptian Ipuwer papyrus describes a series of calamities befalling Egypt, including a river turned to blood, men behaving as wild ibises, and the land generally turned upside down. However, this is usually thought to describe a general and long term ecological disaster lasting for a period of decades, such as that which destroyed the Old Kingdom. The document is usually dated to the end of the Middle Kingdom, or more rarely, to its beginning, fitting the Old Kingdom destruction, but in both cases long before the usual theorized dates for the Exodus.
Immanuel Velikovsky decided that the Egyptian papyrus did, in fact, describe the events of Exodus, along with the major natural catastrophes that he thought preceded it; in his opinion it was the conventional chronologies of Egypt that were wrong by several hundred years.
As noted above, some science writers and Bible researchers have suggested that the plagues were passed-down accounts of ordinary natural disasters, and not supernatural miracles. Natural explanations have been suggested for most of the phenomena:
A volcanic eruption which happened in antiquity and could have caused some of the plagues if it occurred at the right time is the eruption of the Thera volcano 650 miles to the northwest of Egypt. Controversially dated to about 1628 BC, this eruption is one of the largest on record, rivaling that of Tambora, which resulted in 1816's Year Without a Summer. The enormous global impact of this eruption has been recorded in an ash layer deposit found in the Nile delta, tree ring frost scars in the bristlecone pines of the western United States, and a coating of ash in the Greenland ice caps, all dated to the same time and with the same chemical fingerprint as the ash from Thera.
However, all estimates of the date of this eruption are hundreds of years before the Exodus is believed to have taken place; thus the eruption can only have caused some of the plagues if one or other of the dates is wrong, or if the plagues did not actually immediately precede the Exodus.
Following the assumption that at least some of the details are accurately reported, many modern Jews believe that some of the plagues were indeed natural disasters, but argue for the fact that, since they followed one another with such uncommon rapidity, "God's hand was behind them". Indeed, several Biblical commentators (Nachmanides and, more recently, Rabbi Yaakov Kamenetzky) have pointed out that, for the plagues to be a real test of faith, they had to contain an element leading to religious doubt.
In his book The Plagues of Egypt: Archaeology, History, and Science Look at the Bible, Siro Igino Trevisanato explores the theory that the plagues were initially caused by the Santorini eruption in Greece. His hypothesis considers a two-stage eruption over a time of a bit less than two years. His studies place the first eruption in 1602 BC, when volcanic ash taints the Nile, causing the first plague and forming a catalyst for many of the subsequent plagues. In 1600 BC, the plume of a Santorini eruption caused the ninth plague, the days of darkness. Trevisanato hypothesizes that the Egyptians (at that time under the occupation of Hyksos), resorted to human sacrifice in an attempt to appease the gods, for they had viewed the ninth plague as a precursor to more. This human sacrifice became known as the tenth plague.
In an article published in 1996, physician-epidemiologist John S. Marr and co-author Curt Malloy integrated biblical, historical and Egyptological sources with modern scientific conjectures in a comprehensive review of natural explanations for the ten plagues, postulating their own specific explanations for the third, fourth, fifth, sixth, and tenth plagues. Their explanation also accounted for the apparent selectiveness of the plagues, as implied in the Bible. The paper served as the basis for a widely acclaimed website and for a documentary aired on the Learning Channel from 1998 to 2005. 
The last plague has been depicted by critics as a cruel and unjustifiable punishment against the Egyptians, and is criticized for promoting an unethical Schadenfreude ("pleasure taken from someone else's misfortune"). A common and widely accepted Jewish Midrash explains the dreadful plague by expanding upon Exodus 10:28, where Pharaoh threatens to kill Moses:
This Midrash justifies the last plague with two main arguments:
Under this rationale, it can be seen that God is basically committing the same "evil" that Pharaoh intended to commit. By sending a plague that will kill innocent Egyptian children, God is performing that for which Pharaoh deserved punishment – a crime Pharaoh had not yet committed, but fully intended to.
Some scholars, however, disagree with the interpretation of this plague which emphasizes children, and focus rather on the "first-born" aspect of the plague. As was typical in cultures of the time (and is seen many times in the Old Testament), the custom was for the first-born son to be the major inheritor, from the lowest strata of society to the throne of Pharaoh itself; and thus the first-born sons of Egypt would embody the leadership of the families of the nation. In addition, according to this interpretation, the priests of Egypt were largely first-born sons. Thus, in this view, the first-born sons of Egypt were in fact the decision makers, and communally responsible for the deeds of the nation, good or evil.