Aaron ha-Levi of Barcelona

Aaron ha-Levi of Barcelona was a Spanish Talmudist who lived in the late 13th century. He is notable for authoring the first book of religious instruction among Jews in the Middle Ages, a work that would become well-known and influential in the centuries to come. Although the book, Sefer ha-Chinuch, was widely read and commented upon, its author's identity remained obscure until discovered by Rosin. The book itself is anonymous, but it is now accepted that Aaron ha-Levi was the author, based on a statement by Gedaliah ibn Yaḥyah and a subtle allusion to his own identity in the prefatory letter.

Aaron ha-Levi's Sefer ha-Chinuch is a comprehensive guide to the principles of Judaism, intended to educate Jewish youth and laymen about the Law. The book is an enumeration of the 613 affirmative and negative precepts of the Mosaic Law, arranged in the order of weekly lessons. Aaron ha-Levi draws upon the works of prominent authorities such as Maimonides, Naḥmanides, and Alfasi, but his original contribution lies in his emphasis on the ethical aspects of the Law. He approaches the subject with simplicity and religious fervor, avoiding complex philosophical and mystical theories. Through his work, Aaron ha-Levi aimed to impart a knowledge of Judaism to a broad audience, and his method is characterized by a focus on kindness, compassion, and consideration for all living beings.