[4] Isaac was one of the French rabbis to whom Meïr ben Todros Abulafia addressed his letter against Maimonides' theory of resurrection.
[8] Isaac ben Abraham ha-Baḥur may also be identical with the liturgical poet Isaac ben Abraham who wrote a hymn beginning Yeshabbeḥuneka be-ḳol miflal, for Simchat Torah or for the Sabbath after it, and a selichah for Yom Kippur beginning Hen yom ba la-Adonai.
[9] No complete work by him has survived, but his statements are cited in the tosafot to various tractates, chiefly Eruvin, Yoma, Mo'ed Katan, Yevamot, Ketubbot, Kiddushin, Nedarim, Bava Kamma, and Zevaḥim.
During the Maimonidean controversy, Meir b. Todros Abulafia, an opponent of the books of Maimonides, approached him in 1202 to express his opinion.
There is mention of a work by him on the Passover seder, entitled Yesod Rabbenu Yiẓḥak b. Avraham be-Leilei Pesaḥ.