Leviticus 3:8-9

8and 1he shall lay his hand on the head of his offering and 2slay it before the tent of meeting, and Aaron’s sons shall 3sprinkle its blood around on the altar.

9From the 4sacrifice of peace offerings he shall bring as an offering by fire to the Lord, its fat, 5the entire 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,