Reference for Chullin 233:20

אלא מחוורתא כדרב זביד:

I should have said that the fat of the fat tail [of a lamb], which found in an ox, is not subject to the law of Sacrilege;<span class="x" onmousemove="('comment',' For this verse: As it is taken of speaks of the sacrificial portions of an ox, and therefore cannot include the fat of the fat tail of a lamb.');">¹²</span>

Jastrow

Jastrow