Exodus 29:14

29:14 But the meat of the bull, its skin, and its dung you are to burn up outside the camp. It is the purification offering.

Numbers 19:5

19:5 Then the heifer must be burned in his sight – its skin, its flesh, its blood, and its offal is to be burned.

Hebrews 13:11

13:11 For the bodies of those animals whose blood the high priest brings into the sanctuary as an offering for sin are burned outside the camp.