Leviticus 5:12-13

12He is to bring it to the priest, who will take a handful from it as its memorial portion and burn it on the altar along with the food offerings to the Lord; it is a sin offering.

13In this way the priest will make atonement on his behalf concerning the sin he has committed in any of these cases, and he will be forgiven. The rest will belong to the priest, like the grain offering.”