Reference for Chullin 137:13

ותבעי לך קדשים קלים בירושלים

- Raba answered: Certainly it must be so reckoned; for if the [cutting of the] first organ followed by the [cutting of the] second organ has the effect of rendering [the animal] permitted to be eaten, then surely it has the effect of rendering [the limb] clean so that it be not nebelah!<span class="x" onmousemove="('comment',' The answer is this: if only the question of rendering the limb clean is considered it is immaterial whether the foetus put forth its limb before or after or in the course of the slaughtering. Therefore the effect of cutting both organs must be to render the limb clean. The fact that at the time of the cutting of the first organ it was possible that the entire foetus, including this limb, might have been rendered permitted to be eaten, and that this became impossible because of the putting forth of the limb, can be ignored. The argument is an a fortiori argument because it is well established that less is required to render an animal clean than is required to render it permitted to be eaten.');">⁸</span>

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