Leviticus 3:8-9

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

9From the 4sacrifice of peace offerings he shall then bring as an offering by fire to the Lord, its fat, the entire fat tail which he shall remove close to the backbone, the fat that covers the entrails, and all the fat that is on the entrails,