 The other two sets contain his commentary on two important 13th Century Jewish texts.The three-volume "Sefer Hasidim" is a commentary on the 12th-13th Century work of the same name by Judah ben Samuel of Regensburg.The two-volume "Mitzvot Gadol" is a commentary on one of the earliest codifications of Halakah by Judah's student, Moses ben Jacob of Coucy, known as "SeMaG", short for "Sefer Mitzvot Gadol".