Reference for Chullin 180:15

מאי לאו מעלהו ומקטירו

Because it is written: Present it now unto thy governor.<span class="x" onmousemove="('comment',' Mal. I, 8. An expression generally used whenever it is considered improper to offer any particular thing upon the altar. A limb which has been cut up for the removal of the sciatic nerve does not present a fine appearance, and it is therefore suggested that the limb must first be brought up whole upon the altar and while on the altar the nerve must be removed from it.');">⁸</span>

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