Reference for Chullin 136:4

הוציא עובר את ידו והחזירה ואחר כך שחט את אמו מותר באכילה

But the Sages say: It is unclean like that which had touched a slaughtered trefah animal.<span class="x" onmousemove="('comment',' The Sages hold that the limb that protruded is to this extent affected by the slaughtering that it has thereby been rendered clean and is not a source of uncleanness like nebelah. This is on all fours with the case of a trefah animal which, if slaughtered, is thereby rendered clean and is not regarded as nebelah. Nevertheless according to Rabbinic decree, the flesh of a slaughtered trefah animal would render consecrated things unclean by contact, v. infra 73a.');">³</span>

Jastrow

Jastrow

Jastrow