 Polqar wrote several books, most of which are lost. He mentions some of these books in his main work ʿEzer ha-Dat (In Support of the Law): Peirush le-Sefer Bereshit (Commentary on Genesis) [ʿEzer ha-Dat: 39]; Peirush le-Sefer Kohelet (Commentary on Ecclesiastes) [ʿEzer ha-Dat: 121, 123]; Sefer Peirush le-Tehillot (Commentary on the Book of Psalms) [ʿEzer ha-Dat: 131]; and Musar ha-Banim (Instruction of the Sons) [ʿEzer ha-Dat: 158]. Two of Polqar’s works—Iggeret ha-Tiqvah (Epistle on Hope) and Sefer be-Hakḥashat ha-ʿiẓtagninot (Refutation of Astrology)—are mentioned by Abner of Burgos, the famous convert to Christianity and polemicist against Judaism, in his Teshuvot la-Meḥaref (Response to the  Blasphemer)[3]  and Minḥat Qenaot (A  Jealousy-Offering).[4]  Two of Polqar’s works are extant: Teshuvat Apikoros (A Response to the  Heretic),[5]  a letter he addressed to  Abner,[6]  and his major corpus, ʿEzer ha-Dat (In Support of the Law). In addition, Polqar completed Isaac Albalag’s work Tiqqun Deʿot ha-Philosophim (Rectifying the Opinions of the Philosophers), a free paraphrase of al-Ghazālī’s Maqasid al-Falāsifa (The Opinions of the Philosophers), most of which consists of Albalag’s own ideas and of a critique of al-Ghazālī’s presentation of philosophical ideas (see Vajda 1960: 268).