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סֵדֶר הֶכְשֵׁר בָּשָׂר לַאֲכִילָה לְהוֹצִיא מִמֶּנּוּ דַּם הָאָסוּר הוּא

To make meat fit for consumption, the forbidden blood must be removed by the following procedure:

שְׁרִיָּה, מְלִיחָה, הֲדָחָה

[First the meat is] soaked, then salted, and then rinsed.

עִנְיָנָם בָּעֲבוֹדָה

The parallels in our Divine service are: 

הֲדָחָה — נִגּוּן

Soaking — which means immersing oneself in the words of one's Rebbe; 

מְלִיחָה — יְחִידוּת

salting — which means [meeting him at] yechidus; 

שְׁרִיָּה — וֵוייקעֶן זִיךְ אִין דִּבְרֵי הָרַב

rinsing — which means [singing a] niggun.

Text and Translation courtesy of Sichos in English