Leviticus 4:3, 21, 31, 35

if the anointed priest sins, bringing guilt on the people, then let him offer to the LORD for his sin which he has sinned a young bull without blemish as a sin offering.

Then he shall carry the bull outside the camp, and burn it as he burned the first bull. It is a sin offering for the assembly.

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.

He shall remove all its fat, as the fat of the lamb is removed from the sacrifice of the peace offering. Then the priest shall burn it on the altar, according to the offerings made by fire to the LORD. So the priest shall make atonement for his sin that he has committed, and it shall be forgiven him.