Leviticus 4:25

And the priest with his finger shall put some of the blood of this sin offering on the horns of the altar of whole burnt offerings. Now all the blood thereof he is to pour out at the base of the altar of whole burnt offerings and he shall offer all the suet thereof on the altar as he did the suet of the sacrifice of thanksgiving. So the priest shall make atonement for him because of the sins which he hath committed and it shall be forgiven him.