Leviticus 4:20, 31

He shall also do with the bull just as he did with the bull of the sin offering; thus he shall do with it. So the priest shall make atonement for them, and they will be forgiven.

Then he shall remove all its fat, just as the fat was removed from the sacrifice of peace offerings; and the priest shall offer it up in smoke on the altar for a soothing aroma to the LORD. Thus the priest shall make atonement for him, and he will be forgiven.