Reference for Chullin 204:29

ואמר רבא

refers to a limb [severed] from a living creature; and the verse: Ye shall not eat any flesh in the field, that is trefah [torn of beasts],<span class="x" onmousemove="('comment',' Ex. XXII, 30. The interpretation is, flesh in the field i.e., cut away from its place in the living animal, or flesh of a trefah animal, ye shall not e');"><sup>19</sup></span>