Reference for Chullin 246:8

אי בטומאה דאורייתא הכי נמי הכא במאי עסקינן בטומאה דרבנן

If it were a case of uncleanness as enjoined by the Torah this would indeed be so; but here we really speak of uncleanness as enjoined by the Rabbis.<span class="x" onmousemove="('comment',' I.e., the ruling with regard to an unclean person flaying a clean animal as stated in our Mishnah, refers to a person that was rendered unclean by enactment of the Rabbis (cf. the cases enumerated in Shab. 13b) and the animal spoken of was a consecrated animal. Accordingly we do not impose any further preventive measures by reason of such remote apprehensions.');">⁵</span>

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