Leviticus 4:25-26

25The kohen shall take some of the blood of the sin offering with his finger and put it on the horns of the altar of burnt offering. He is to pour out the rest of its blood at the base of the altar of burnt offering.

26He is to burn all its fat on the altar, just like the fat of the sacrifice of fellowship offerings. So the kohen should make atonement for him concerning his sin—and he will be forgiven.