Leviticus 4:20, 31

And he shall do with the bull as he did with the bull as a sin offering; thus he shall do with it. So the priest shall make atonement for them, and it shall be forgiven them.

He shall remove all its fat, as fat is removed from the sacrifice of the peace offering; and the priest shall burn it on the altar for a sweet aroma to the LORD. So the priest shall make atonement for him, and it shall be forgiven him.