Leviticus 5:12-13

12They are to bring it to the priest, who shall take a handful of it as a memorial portion and burn it on the altar on top of the food offerings presented to the Lord. It is a sin offering.

13In this way the priest will make atonement for them for any of these sins they have committed, and they will be forgiven. The rest of the offering will belong to the priest, as in the case of the grain offering.’ ”