David ben Abraham al-Fāsī was a Karaite lexicographer and exegete in the mid-tenth century. His most famous work, Kitāb Jāmiʿ al-Alfāẓ, was the first Hebrew-Arabic dictionary of the Hebrew Bible. Although al-Fāsī or his family probably came from the city of Fez in Morocco, as suggested by his cognomen, he appears to have spent part of his life in Jerusalem, where he is believed to have composed his monumental dictionary sometime in the first half of the tenth century. He is not mentioned in Ibn al-Hītī’s chronicle of Karaite scholars, but there is other evidence connecting him to the Karaite …