During this time of his life, he became a student of Rabbi Asher ben Jehiel.
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The Baraita of the Forty-nine Rules (Hebrew: ברייתא מ"ט מדות) is a work of rabbinical literature which is no longer in existence except in references by later authorities. Rashi, the Tosafists, Abraham ibn Ezra, Yalḳut, and Asher ben Jehiel mention a work, "Baraita of the Forty-nine Rules," and make citations from it (thus, Rashi, ed. Berliner, on Ex. xxvi. 5; Yalḳ., Gen. 61, calls it "Midrash"; Rashi on Ex. xxvii. 6 calls it "Mishnah").
He studied under Rabbeinu Tam at Troyes and David ben Kalonymus of Münzenberg, and for ten years attended the Yeshiva of Rabbi Isaac ben Samuel ha-Zaken (the Ri) of Dampierre, after whose death he took charge of the yeshiva of Sens. The Rosh said of him that only Rabbeinu Tam and Rabbi Isaac ben Samuel exercised greater influence upon Talmudical studies in France and in Germany during the 13th century.