Commentary for Chullin 137:26

לא צריכא דאזל אבן פקועה דכוותיה מאי

We therefore must say that the seed is mixed up, but the question that was raised was really this: an ordinary animal is the product of the forbidden fat and of the blood [of the sire],<span class="x" onmousemove="('comment',' For it is held that every part of the body is a contributory factor in the act of procreation, including also the two forbidden substances in the animal body, viz., the blood and the fat.');">¹⁵</span>

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