Братья Горовиц поют "Ав ѓа-рахамим" в крематории Терезинского лагеря

"The Horizontal Society" tidbit 3: What is "Halakha le-Moshe mi-Sinai?"

There is a special group of halakhot classified by the rabbis as ‘A halakha of Moses from Sinai’: see Mishna ‘Eduyot 4:3; 8:7, Tosefta Sukka 3:1, p. 266: Yadayim 2:16, p. 683. It is a major rabbinic concept. In a sense, “the entire Tora,” including the oral tradition, is “halakha of Moses from Sinai”: see Nidda 45a: and cf. Arukh. s.v. mad (I); R. Judah ha-Levi, Kuzari III, 21, pp. 128-130; “Introduction.” Perush ha-Mishnayot, vol. 1, p. 16. Not all of these halakhot were originally designated as such. An opinion could have been registered in the Mishna as a halakha without any qualifications (see Mishna ‘Or/a 3:9), and upon consideration the Talmudic authorities would classify it as ‘A halakha of Moses from Sinai’; see Baba Batra 12b: Yerushalmi ‘Orla Ill, 7, 63b: Qiddushin 37a; MT Ma‘akhalot Asurot 10:10; Perush ha-Mishnayot, ‘Orla 3:9, vol. 1. p. 415.

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