Leviticus 4:19-21

He shall take all the fat from it and burn it on the altar. 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. 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.