In this work he enumerates former authors who had written on the same subject, such as Joseph ben Abraham, Jeshua ben Judah, and Aaron ben Elijah. "Zebach Pesach" (The Passover Sacrifice), on the celebration of the festival days, in which he quotes many passages from the Arabic originals of Jeshuah ben Judah's commentary upon the Torah, from the commentary of Jacob Qirqisani, from Jeshuah ben Judah's other works, and from the "Sefer ha-Mizvot" of Daniel al-Kumisi. "Matteh Elohim" (The Rod of God), which contains a history of the Karaite-Rabbinic schism; the chain of Karaite tradition, which the author claims to have received from Japheth ibn Saghir; interpretation of the Torah, and particularly of the precepts which are arranged in numbers according to the Ten Commandments.