Leviticus 5:12-13

12He must bring it to the priest and the priest must scoop out from it a handful as its memorial portion and offer it up in smoke on the altar on top of the other gifts of the Lord – it is a sin offering.

13So the priest will make atonement on his behalf for his sin which he has committed by doing one of these things, and he will be forgiven. The remainder of the offering will belong to the priest like the grain offering.’”