Sha’arei Teshuvah (Gates of Repentance) is one of the basic works of Judaism on repentance and conduct. It is divided into four portals (sha=arim), namely repentance and its principles; how one may awaken himself to return to God; recognizing the stringency of the mitzvot and the punishments for their violation; and Atonement. Each of these portals is in turn subdivided into smaller units. It has been suggested that Jonah was influenced by the Sefer Hasidim of Judah he-Hasid, but this is uncertain. Sha'arei Teshuvah is Jonah=s most important and influential work. Among the other ethical works written by him are Iggeret Teshuvah (Constantinople, 1548), Sha’arei ha-Avodah (Bnei Brak, 1967), recently discovered and, although the attribution is uncertain, credited to Jonah. These works, together with Sha'arei Teshuvah and Sefer ha-Yirah, may be part of Sha=arei Zedek, a larger work cited by Hisdai Crescas but no longer extant. Jonah also wrote a commentary on Hilkhot Rav Alfas, compiled by his students, of which only the portion on Berakhot has been published; novellae on Bava Batra and Sanhedrin, as well as on other tractates that are no longer extant; and commentaries on Proverbs and Avot. Other works are credited to Jonah in the writings of rishonim (early sages) and more recently several books have been ascribed to him, but these attributions are unsubstantiated.

השער בצבע כחול. בראש הספר: תשובה ע"ד השאלה בנידון אשה שמת בעלה והניחה מעוברת ואח"כ ילדה ולד מת, ויש עדות נשים שכלו לו חדשיו אם יש להתיר אשה זו בלי חליצה.