Leviticus 3:8-9

8And he shall lay his hand on the head of his offering, and kill it before the tabernacle of meeting; and Aaron’s sons shall sprinkle its blood all around on the altar.

9‘Then he shall offer from the sacrifice of the peace offering, as an offering made by fire to the Lord, its fat and the whole fat tail which he shall remove close to the backbone. And the fat that covers the entrails and all the fat that is on the entrails,