Leviticus 4:7-8

7The priest must then put some of the blood on the horns of the altar of fragrant incense that is before the LORD in the Tent of Meeting. And he is to pour out the rest of the bull’s blood at the base of the altar of burnt offering at the entrance to the Tent of Meeting. 8Then he shall remove all the fat from the bull of the sin offering—the fat that covers the entrails, all the fat that is on them,