R. Chananel wrote the first extant systematic commentary on the
Talmud, today included in the
Vilna edition Talmud page on certain
tractates. The commentary, only parts of which survive, addresses sections of the Talmud relevant to legal practice at the time of writing: the orders
Moed,
Nashim, and
Nezikin. Some fragments have been recovered from the
Cairo Genizah and are published in B. M. Levin's
Otzar ha-Geonim, though certain fragments may in fact represent geonic material from which R. Chananel copied, in particular the work of
Hai Gaon. R. Chananel's commentary presents a paraphrased summary and explanation of the main arguments in the
gemara, omitting most of the non-legal sections (
Aggada) as well as sections that R. Chananel considered too simple to warrant further explanation. A distinctive feature of the commentary is the presentation of the parallel passages from the
Jerusalem Talmud. He is one of the most widely quoted commentaries by all the rishonim including
Rashi,
Tosafot and the
Rif. His opinion is highly regarded in halacha and correct versions of the texts which is used as a basis for Maimonides and many other later halachic authorities. In places where we don't have his commentary, his opinion is usually known from other sources due to mass quotation from all the
Rishonim. An edition of the commentary published by Vagshal covers tractate Berachot and order Moed, which also includes the
Sefer ha-Mafteaḥ of his colleague
Nissim Gaon. R. Chananel also authored a
commentary on the
Torah, cited by many later Biblical commentators, chiefly
Bahya ben Asher. This commentary is to some extent directed against the
Karaites. While no full copy of this work survives, we possess many fragments of it; it has recently been published by the
Mosad Ha-Rav Kook as a separate work, as well as in the
Torat Hayyim Torah edition with commentaries. Other works by Rabbeinu Chananel include
responsa; a number of
Rishonim attribute to him the anonymous "Sefer ha-Miktzo'ot,"
decisions on
ritual law. ==See also==