Joseph ben Abraham (Hebrew: יוסף בן אברהם הכהן, also known by the Arabic name Yusuf al-Basir) was a Karaite philosopher and theologian who flourished in Babylonia or Persia in the first half of the eleventh century. He was the teacher of, among others, Jeshua ben Judah (Abu al-Faraj Furkan ibn Asad). By way of euphemism he was surnamed "ha-Ro'eh" (= "the seer"), on account of his blindness. This infirmity, however, did not prevent him from undertaking long journeys, probably as a Karaite missionary. In the course of his travels he frequented the religio-philosophical schools of the Mu'tazili, whose teachings he defended in his works. Of these the most important is the Muhtawi, translated from the Arabic into Hebrew, perhaps by , under the title Sefer ha-Ne'imot, or Zikron ha-Datot. It is d