EXOD300 Let us first consider the question of the authority or source of obligation of these wider and more vague areas of Jewish morality. We find that the Rabbis had a proof-text or biblical source upon which to append their notion of lifnim mi-shurat da-din: "And thou shalt show them the way they shall walk therein and the actions which they shall do." Rabbi Eliezer of Modi'in says: "and the actions" refers to din proper; "and they shall do" refers to lifnim mi-shurat ha-din [this verse; Mekhilta, Yitro; Bava Kamma 100]. Thus, the Torah itself urges us to conduct ourselves beyond the measure of the law. Indeed, Rabbi Isaac of Corbeil lists the obligation of lifnim mi-shurat ha-din as one of the 613 commandments (Sefer Mitzvot Katan). (Continued at [[DEUT290]] Deuteronomy 6:18 right SPERO 169)