Leviticus 4:3, 21, 31, 35

if the anointed priest sins so as to bring guilt on the people, then let him offer to the LORD a bull without defect as a sin offering for the sin he has committed.

Then he is to bring out the bull to a place outside the camp and burn it as he burned the first bull; it is the sin offering for the assembly.

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.

Then he shall remove all its fat, just as the fat of the lamb is removed from the sacrifice of the peace offerings, and the priest shall offer them up in smoke on the altar, on the offerings by fire to the LORD. Thus the priest shall make atonement for him in regard to his sin which he has committed, and he will be forgiven.