Leviticus 5:12-13

12Take the flour to the priest, who will scoop out a handful as a representative portion. He will burn it on the altar on top of the special gifts presented to the Lord. It is an offering for sin.

13Through this process, the priest will purify those who are guilty of any of these sins, making them right with the Lord, and they will be forgiven. The rest of the flour will belong to the priest, just as with the grain offering.”