Reference for Chullin 179:31
כתוב אחד אומר והקטיר הכהן את הכל ריבה וכתוב אחד אומר ועשית עולותיך הבשר והדם מיעט
For it has been taught: 'And the priest shall burn the whole', this includes bones, nerves, horns and hoofs, even if they are severed.
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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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