Reference for Chullin 246:9

תינח טמא בטהורה טהור בטמאה טומאה דאורייתא היא

This is well in the case of an unclean person [flaying] a clean animal, but in the case of a clean person [flaying] an unclean animal, surely the uncleanness is enjoined by the Torah!<span class="x" onmousemove="('comment',' I.e., the uncleanness of nebelah.');">⁶</span>

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