Reference for Zevachim 38:15

א"ל רב סמא בריה דרב אשי לרבינא וליתיב מיתב ולקדש אמר קרא (שמות ל, כ) לשרת ושירות מעומד הוא:

R'Jose son of Judah said: He places his both hands on each other and on his two feet lying on each other, and sanctifies them. Said they to him: You have made it too hard, for it is impossible to do it thus.

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