Leviticus 4:8-10

4:8 “‘Then he must take up all the fat from the sin offering bull: the fat covering the entrails and all the fat surrounding the entrails, 4:9 the two kidneys with the fat on their sinews, and the protruding lobe on the liver (which he is to remove along with the kidneys) 4:10 – just as it is taken from the ox of the peace offering sacrifice – and the priest must offer them up in smoke on the altar of burnt offering.

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.