Jacob ben Reuben

Who is Jacob ben Reuben?

Jacob ben Reuben was a Karaite scholar and Bible exegete of the eleventh century. He wrote a brief Hebrew language commentary on the entire Bible, which he entitled Sefer ha-'Osher, because, as he says in the introduction, the reader will find therein sufficient information, and will not need to have recourse to the many voluminous commentaries which the author himself had consulted. The book is, in fact, merely a compilation; the author's explanation of any given passage is frequently introduced by the abbreviations or; and divergent explanations of other commentators are added one after the other and preceded by the vague phrase. It is, in fact, chiefly an extract of Yefet ben Ali's work, from whom Jacob borrowed most of his explanations as well as the quotations from various authors, chiefly on the Pentateuch. But Jacob also drew upon later Karaite authors, the last of whom is Jeshua ben Judah, who, so far as is known, flourished about 1054. This date points to the second half of the eleventh century as the date of composition of the Sefer ha-'Osher.