Reference for Chullin 279:35

אלא לשחיטה

If for the one that was to be slaughtered, but surely it must be set free!<span class="x" onmousemove="('comment',' In order to fulfil the rites for the purification of the first leper; thus it certainly may not be slaughtered for the second leper.');">²⁵</span>

Jastrow

Jastrow