Leviticus 4:7-8

7And the priest shall put some of the blood upon the horns of the altar of sweet incense before the Lord, which is in the tabernacle of the congregation; and shall pour all the blood of the bullock at the bottom of the altar of the burnt offering, which is at the door of the tabernacle of the congregation.

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