إخوان الصفا
Hoter ben Shlomo was a scholar and philosopher in Yemen heavily influenced by Nethanel ben al-Fayyumi, Maimonides, Saadia Gaon and al-Ghazali. The connection between the "Epistle of the Brethren of Purity" and Ismailism suggests the adoption of this work as one of the main sources of what would become known as "Jewish Ismailism" as found in Late Medieval Yemenite Judaism. "Jewish Ismailism" consisted of adapting, to Judaism, a few Ismaili doctrines about cosmology, prophecy, and hermeneutics. There are many examples of the Brethren of Purity influencing Yemenite Jewish philosophers and authors in the period 1150–1550. Some traces of Brethren of Purity doctrines, as well as of their numerology, are found in two Yemenite philosophical midrashim written in 1420–1430: "Midrash ha-hefez" ("The Glad Learning") by Zerahyah ha-Rofé (a/k/a Yahya al-Tabib) and the "Siraj al-'uqul" ("Lamp of Intellects") by Hoter ben Solomon.