Reference for Chullin 22:1

דילמא חד מינייהו טריפה הוא

that one of them is trefah?<span class="x" onmousemove="('comment',' l.e., the one which was to be sent to the wilderness. It was obviously impossible to examine it as to any defects, since it was sent away alive.');">¹</span>

Jastrow