Leviticus 4:7-8

7and the priest shall put of the blood on the horns of the altar of fragrant incense, which is in the tent of meeting, before Jehovah; and he shall pour all the blood of the bullock at the bottom of the altar of burnt-offering, which is at the entrance of the tent of meeting.

8And all the fat of the bullock of the sin-offering shall he take off from it; the fat that covereth the inwards, and all the fat that is on the inwards,