Reference for Chullin 279:9

לעולם בשחוטה דמצורע ולעבור עליו בעשה ובלא תעשה

And if it is the slaughtered bird of the leper,<span class="x" onmousemove="('comment',' Lev. XIV, 4, 5. Of the two birds used in the purification rites of a leper one was slaughtered and was thereupon rendered forbidden for all purposes, cf. Kid. 57a, A.Z. 74a.');">⁶</span>

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