New answers tagged provenance
I shall excerpt some items from this Beurei Hatefila article that addresses the origin of the custom to kiss the tzizit during Kri'at Shema. Oviously, kissing them involves holding them, so the article addresses specifically your question and more: Shulchan Aruch Orach Chaim 24:2 It is a Mitzvah to hold one’s Tzitzit in one’s left hand and on top of ...
A source I have heard for a Seudas Preida is from Elisha. This is mentioned in Melachim-1 19:21 - see Radak that he made a Seuda when he was leaving.
The Encyclopedia of Jewish Prayer: The Ashkenazic and Sephardic Rites (Macy Nulman) has the following on the beating of the heart during Viduy When saying Ashamnu we stand somewhat bent over, without leaning on any kind of support, just as in reciting Modim (MB, 607:10 ; Magen Avraham 607:4), a position of abject humility and contrition. One should ...
The Rama himself actually forbids haircuts starting on the 17th of Tammuz (ShA OC 551:4). In his Darkei Moshe, he cites Minhagim Tirna on Tammuz (written ~1400 CE) which mentions this custom.
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