Reference for Bekhorot 66:7

מה שמשביח בעור פגם בבשר

it was said in the name of Rabina: [The reason is] because it appears like doing work with sacrificial animals.<span class="x" onmousemove="('comment',' Preparing the skin for a bellows when it is still on the sacrificial animal, and one can still say that the Baraitha above which forbids the flaying of the skin from the feet expresses the view of all the authorities concerned.');">⁶</span>

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