 S.M. Stern argues for the existence of a lost pseudepigraphic Arabic treatise which influenced the longer recension of The Theology of Aristotle and Isaac Israeli, and was quoted without proper attribution by both. Further, he argues that this same treatise is identical to a philosophical excursus which was appended to the literary tale The Tale of the Prince and the Ascetic (Hebrew: Sefer ben ha-melech veha-nazir) when Abraham Ibn Hasday translated the text from Arabic (Bilawhar wa-Yudasaf) into Hebrew in the thirteenth century. Although one may be tempted to conjecture that the Neoplatonist appendix is an original work by Ibn Hasday which largely paraphrases Israeli—a hypothesis strengthened by the fact that Ibn Hasday had translated Israeli’s Book of the Elements—Stern disproves this possibility by demonstrating that Israeli’s Book of Substances is largely a commentary on the metaphysics of Ibn Hasday’s treatise, and Israeli’s Book on Spirit and the Soul is an attempt to reconcile Ibn Hasday’s treatise with scriptural proof texts. Hence, according to Altmann and Stern, Israeli was strongly influenced by this treatise they call “Ibn Hasday’s Neoplatonist.” Further, we know that Israeli did not author this treatise, for when he quoted it, he cited “the philosopher,” thereby indicating that he thought he was quoting Aristotle.