Reference for Chullin 179:33
מחוברין יעלו פרשו אפילו בראשו של מזבח ירדו
With reference to those portions which have jumped off [the altar]; thus, only half-burnt flesh you may replace [if it had jumped off the altar], but you may not replace half-burnt nerves and bones.
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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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