Reference for Chullin 40:15

הא פסול פסול

Now if you were to say that [in Ze'iri's case] the animal is merely trefah, should not the knife in this case have the effect of removing [from this bird] the uncleanness of nebelah,<span class="x" onmousemove="('comment',' In accordance with the Rabbinic dictum, infra 228b: A trefah animal that has been ritually slaughtered does not convey any uncleanness.');">⁹</span>

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