Tanya: It is plain (p. 491) ...the other letters. (p. 493).
The procedure of "kashering" meat for eating - by purging it of forbidden blood - is: Soaking, salting and rinsing. These concepts in avoda: "Soaking" - immersing oneself in the Rebbe's words; "salting" - yechidus; "rinsing" - chassidic song (niggun).
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