Leviticus 5:12-13

12He shall bring it to the priest, who shall take a handful of it as a memorial portion and offer it up in smoke on the altar, with the offerings by fire to the Lord; it is a sin offering.

13In this way the priest shall make atonement for him for the sin which he has committed in one of these things, and it will be forgiven him; then the rest shall be for the priest, like the grain offering.’ ”