Isaac ben Jacob Alfasi (1013–1103) (, ), also known as the Alfasi or by his Hebrew acronym, the Rif (Rabbi Isaac al-Fasi), was a Maghrebi Talmudist and posek (decider in matters of Halakha). He is best known for his halakhic legal work Sefer Ha-halachot, considered the first fundamental work in halakhic literature.
Biography
He was born in Qal'at Bani Hammad in modern-day Algeria, the capital city of the Sanhaja Hammadid dynasty of the central Maghreb, and is sometimes called "ha-Kala'i" because of it. hence the name "al fasi". Fez's Jewish community undertook to support him and his family so that he could work on his Sefer Ha-halachot undisturbed. They also founded a yeshiva in his honor, and many students throughout Morocco came to study under his guidance. The most famous of his many students is Judah Halevi, author of the Kuzari; he also taught Joseph ibn Migash (the Ri Migash), who was in turn a teacher of Rabbi Maimon, father and teacher of Maimonides (Rambam).
Alfasi remained in Fez for 40 years, during which time he completed his Sefer Ha-halachot. In 1088, aged seventy-five, two informers denounced him to the government upon some unknown charge. He left Fes for Al-Andalus, eventually becoming head of the yeshiva in Lucena, Córdoba in 1089.
His "magnanimous character" is illustrated by two incidents. When his opponent Isaac Albalia died, Alfasi adopted Albalia's son. When Alfasi was himself on the point of death, he recommended as his successor in the Lucena rabbinate, not his own son, but his pupil Joseph ibn Migash.
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Sefer haHalachot
Sefer ha-Halachot (ספר ההלכות), also known as Hilchot haRif or Hilchot Rav Alfas (Hebrew: הלכות רב אלפס), was Alfasi's main work, written in Fez. It extracts all the pertinent legal decisions from the three Talmudic orders Moed, Nashim and Nezikin as well as the tractates of Berachot and Chulin - 24 tractates in all. Alfasi transcribed the Talmud's halakhic conclusions verbatim, without the surrounding deliberations; he also excludes all Aggadic (non-legal, homiletic) matter as well as discussion of the halakha practicable only in Land of Israel.
Generally the work follows the ordering of the Talmud, but sometimes Talmudic excerpts are moved from place to place, and very rarely non-Talmudic texts are incorporated into the work.
Impact
Maimonides wrote that Alfasi's work "has superseded all the geonic codes…for it contains all the decisions and laws which we need in our day…".
Sefer ha-Halachot plays a fundamental role in the development of Halakha. Firstly, "the Rif" succeeded in producing a Digest, which became the object of close study, and led in its turn to the great Codes of Maimonides and of Rabbi Joseph Karo.