Posek (Hebrew פוסק, IPA: [po·ˈseq], pl. Poskim, פוסקים) is the term in Jewish law for "decider"—a legal scholar who decides the Halakha in cases of law where previous authorities are inconclusive.
The decision of a posek is known as a psak din or psak halakha ("ruling of law"; pl. piskei din, piskei halakha) or simply a "psak". In Hebrew, פסק is the root implying to "stop" or "cease"—the posek brings the process of legal debate to finality. Piskei din are generally recorded in the responsa literature.
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In formulating a ruling, a posek will base the psak din on a careful analysis of the relevant underlying legal principles, as well as a careful study of the application of these principles. A Posek will therefore be thoroughly versed in rabbinic literature and must be a master Talmudist.
The analysis of the legal principles will entail:
The ruling itself—effectively an application of these principles—will also be consistent with all relevant legal precedents as recorded in the responsa literature, and with all relevant codified law with an emphasis on the Shulkhan Arukh.
In Orthodox Judaism poskim will not overrule a specific law, unless based on an earlier authority: a posek will generally extend a law to new situations, but will not change the Halakhah; see further under Orthodox Judaism. (Thus for example, some Halakhic rulings related to electricity when it was new, were derived from rulings concerning another form of human-managed energy, "fire", but that view was subsequently modified as the nature of electricity was clarified when used as an electrical circuit.)
Poskim play an integral role in Haredi Judaism and Orthodox Judaism. Particularly in the Haredi world, each community will regard one of its poskim as its Posek HaDor ("Posek of the present Generation"). For Lithuanian-style Haredi world it is probably Rabbi Yosef Shalom Eliashiv. For the Sephardi Jews it is probably Rabbi Ovadia Yosef. Hasidic Jews rely on their own Rebbes or leading posek recommended by their Rebbes. Modern Orthodox Jews may select a posek on a more individual rather than a communal basis, although customs vary.
Conservative Judaism and Masorti Judaism may re-interpret or even change a law through a formal argument. There are some poskim in the Conservative movement, e.g. Rabbis Louis Ginzberg, David Golinkin, Joel Roth, and Elliot Dorff. In addition, the Conservative movement's Rabbinical Assembly maintains a Committee on Jewish Law and Standards, whose decisions are accepted as authoritative within the Conservative movement. The rulings of any one individual rabbi are considered less binding than a consensus ruling.
Poskim are not found in Reform Judaism and Reconstructionist Judaism, as these movements stress individual autonomy for interpretation of biblical and oral law. Nevertheless, since these movements consider Jewish law for various decisions, responsa on halakhah have been written by some Reform Rabbis, including Solomon Freehof and Walter Jacob. Full text collections of Reform responsa are available on the movement's website.
For a listing of major works of responsa by author, see the Bar Ilan University Responsa project website [1].
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