Various [[rabbinic literature|rabbinic sources]] have different positions on the way the seven laws are to be subdivided in categories. [[Maimonides]] (Melakhim 10:6) lists one additional Noahide commandment forbidding the coupling of different kinds of animals and the mixing of trees. Maimonides commentator Radbaz expressed surprise that he left out castration and sorcery which were listed in the Talmud (Sanhedrin 56b).
The [[tenth century]] Rabbi [[Saadia Gaon]] added included [[tithe]]s and [[levirate marriage]]. The [[eleventh century]] Rav Nissim Gaon states that all religious acts which can be understood through human reasoning are obligatory upon Jew and Gentile alike. According to this reasoning, he included "listening to God's Voice", "knowing God" and "serving God" besides going on to say that all religious acts which can be understood through human reasoning are obligatory upon Jew and Gentile alike. The [[fourteenth century]] Rabbi [[Nissim of Gerona|Nissim ben Reuben Gerondi]] added included the commandment of charity.
The [[sixteenth century]] work ''Asarah Maamarot'' by Rabbi [[Menahem Azariah of Fano]] (Rema mi-Fano) enumerates thirty commandments, listing the latter twenty-three as extensions of the original seven. Another commentator (''Kol Hidushei Maharitz Chayess'' I, end Ch. 10) suggests these are not related to the first seven, nor based on Scripture, but were passed down by oral tradition. The number thirty derives from the statement of the Talmudic sage Ulla in tractate Hullin 92a, though he lists only three other rules in addition to the original seven, consisting of the prohibitions against homosexuality and cannibalism, as well as the imperative to honor the Torah.
