Some traces of Brethren of Purity doctrines, as well as of their numerology or Hurufism, are found in two Yemenite philosophical midrashim written in 1420-1430: "The Glad Learning" (Midrash ha-hefez) by Zerahyah ha-Rofé (Yahya al-Tabib) and the "Lamp of Intellects" (Siraj al-‘uqul) by Hoter ben Solomon. Ḥoter’s ideas are expounded in his al-Qawāʿid "Commentary" [on Maimonides’ Thirteen Principles]", the Sabʿīn Masʾala "Seventy Questions" and Miʾa Masʾala "One Hundred Questions", listed together as Sheʾelot u-Teshuvot Hoter ben Shelomo, the Sirāj al-ʿUqūl "Lamp of the Intellects", a midrash to the Torah, and Sharh ʿalā Perush ha-Mishna [shel ha-Rambam] "Explication of [Maimonides’] Commentary to the Mishna".[5]