Reference for Chullin 137:37

ולמאן

After all the milk of all animals is very much like a limb taken away from the living animal, nevertheless it is permitted, likewise in this case [it should be permitted]; or perhaps [we ought to distinguish this case, for] in all other cases the prohibition can be remedied by slaughtering, but in this case it cannot.<span class="x" onmousemove="('comment',' For the prohibition of the protruded limb can in no manner be removed.');">²³</span>

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