Related for Menachot 58:15

בהר סיני [AND THE LORD SPOKE UNTO MOSES] ON THE MOUNT SINAI — What has the matter of the Sabbatical year to do with Mount Sinai that Scripture felt compelled to expressly state where it was commanded? Were not all commandments given on Sinai? But this statement is intended to suggest the following comparison: How is it in the case of the law of Shemittah? Its general rules, [its specific prescriptions] and minute details were ordained on Mount Sinai! So, also, were all commandments with their general rules and their minute details ordained on Mount Sinai. Thus is taught in Torath Cohanim (Sifra, Behar, Section 1 1). It seems to me that the following is the explanation of this: Since we do not find in Deuteronomy that the law concerning “the rest of the soil in the Sabbatical year” was repeated in “the fields of Moab” (cf. Deuteronomy 34:1; the place where Moses repeated many of the commandments contained in the other books of the Pentateuch), we may infer that all its general rules and specific prescriptions must have been promulgated on Sinai. The express mention of בהר סיני here appears therefore to be unnecessary but Scripture by mentioning it intends to teach regarding every Divine command (lit., Divine utterance) that was spoken to Moses that in every case they, their general rules and minute details originated at Sinai and that they were only repeated again in “the fields of Moab”.