Reference for Chullin 179:10
ולדות קדשים בהווייתן הן קדושים
- Rather it must be that we are dealing with the case of a firstling which is consecrated only [when it comes forth out of] the womb.<span class="x" onmousemove="('comment',' The prohibition of the sciatic nerve applies only to a firstling since this prohibition and the prohibition of consecrated things attach simultaneously, but it does not apply to other consecrated animals for they are consecrated even while a foetus in the womb, so that the prohibition of the sciatic nerve cannot be superimposed later.');"><sup>7</sup></span>
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Sifrei Devarim
"And you shall offer your burnt-offerings": I might think that he should remove the sinews and the bones, and place the flesh upon the altar; it is, therefore, written "the whole." How are the verses to be resolved? If they are attached, they are to be offered up. If they became detached, even on top of the altar, they are to be taken down.
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