28 And the priest shall make an atonement for the soul that sinned ignorantly with the sin offering before the LORD and reconcile him, and it shall be forgiven him.
Numbers 15:28 Cross References - MSTC
Leviticus 4:35
35 And he shall take away all the fat thereof, as the fat of the sheep of the peace offerings was taken away. And the priest shall burn it upon the altar for the LORD's sacrifice, and the priest shall make an atonement for his sin, and it shall be forgiven him."'