The Epistle of Judah ibn Quraysh is a unique document in the annals of Hebrew linguistic scholarship. Composed in North Africa in the 10th century CE by a man about whom we know practically nothing, the text is one of the first to systematically analyze the linguistic parallels between the Semitic languages known at the time. The essence of the work is three separate glossaries of cognates (Hebrew– Aramaic, Biblical Hebrew–Rabbinic Hebrew, Hebrew–Arabic), followed by a substantial section on grammatical parallels. It has not been extensively studied, although it has been published in at least four different editions: Bargès and Goldberg in 1857, Mosheh Katz in 1951, Moses Goodstein in 1960, and finally this critical edition by Dan Becker in 1984.