Rav Isaac bar Rav Judah (Hebrew: רב יצחק בריה דרב יהודה) was a Babylonian rabbi who lived in the 4th century (fourth generation of amoraim).
Biography His father and principle teacher was Rav Judah ben Ezekiel, who was probably quite old when Isaac was born.As shown by the fact that he learned Torah from rabbis who lived a generation or two generations later - Rav Sheshet and Rami bar Hama. In his childhood Isaac already showed signs of unusual intelligence. Isaac and his father debated many halakhic issues together.i.e. Babylonian Talmud, Shabbat 91a His father regarded him highly, and would repeat teachings in his son's name, which was considered unusual, since usually the student would quote the teacher and not the reverse.Babylonian Talmud, Tractate Shabbat 151a At times he would comment on his father's work.Babylonian Talmud, Eruvin 80b, 97a
Isaac did not marry until a late age, because his father Judah did not know how to find a family with sufficiently good lineage, until Ulla visited and taught Judah a method for estimating lineage.Babylonian Talmud, Kiddushin 71b Isaac studied also under Rav Huna,Babylonian Talmud, Niddah 17b as well as under Rabbah bar Nahmani along with Rav Samuel, the son of Rabbah bar bar Hana, and Aha bar Hana.Babylonian Talmud, Shevu'ot 36b
After their deaths, he became a student of Rami bar Hama. However, he did not like Rami's reliance on logical argumentation rather than reference to tradition,Babylonian Talmud, Eruvin 90a and so he left Rami's lectures, to study under Rav Sheshet who would answer questions based on previous sources.Babylonian Talmud, Zevachim 96b
Along with his brother, ,On his brother see: Babylonian Talmud, Pesahim 12a, 40a; Yebamot 88b he debated halacha with Abaye and Rava.Babylonian Talmud, Eruvin 84a
His family His granddaughter Homa, the daughter of his son Issi, was termed Isha katlanit ("lethal/deadly woman"), since she married three men, all of whom died: , Rab Isaac, the son of Rabbah bar bar Hana, and Abaye.Babylonian Talmud, Yebamot 64b
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