Leviticus 2:2

2:2 Then he must bring it to the sons of Aaron, the priests, and the priest must scoop out from there a handful of its choice wheat flour and some of its olive oil in addition to all of its frankincense, and the priest must offer its memorial portion up in smoke on the altar – it is a gift of a soothing aroma to the Lord.

Leviticus 4:35

4:35 Then the one who brought the offering must remove all its fat (just as the fat of the sheep is removed from the peace offering sacrifice) and the priest must offer them up in smoke on the altar on top of the other gifts of the Lord. So the priest will make atonement on his behalf for his sin which he has committed and he will be forgiven.