Reference for Bekhorot 48:16

טעמא דרבי יוסי בן המשולם משום דקסבר

PROVIDED HOWEVER THAT HE DOES NOT REMOVE THE WOOL FROM ITS PLACE<span class="x" onmousemove="('comment',' That it should not be said that he is shearing a firstling's wool, an action which is forbidden. Therefore he leaves the animal with its wool on both sides (Rashi) .');">¹¹</span>

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