Jeshua ben Judah (also known as Abū ʾl-Faraj Furqān ibn Asad) was one of the most renowned Karaite scholars in eleventh-century Jerusalem. An outstanding Karaite philosopher and Bible exegete who flourished circa 1040-1060, he was a student of Levi ben Japheth, Yūsuf al-Baṣīr, and Abū ʾl-Faraj Hārūn.
Following his mentor Yūsuf al-Baṣīr, Jeshua became a prominent exponent of the Jewish kalām (scholastic theology), which was influenced by the Baṣran school of the Muʿtazila. The philosophical work of al-Baṣīr and Jeshua became the recognized theology of Karaism for ma…