Nothing is known about the life or exact dates of Obadiah ha-Sefardi, a medieval Iberian translator of linguistic works. His most important work was doubtless the translation from Arabic into Hebrew of Jonah ibn Janāḥ’s Kitāb al-Mustalḥaq (Book of Complement; Heb. Sefer ha-Hassaga - Book of Criticism) which tried to complete, but in a critical way, the work of Judah Ḥayyūj on the weak and geminated verbs. Obadiah’s translation has come down to us in two manuscripts, both of which were used for the critical edition of the Hebrew version of Ibn Janāḥ’s boo…