Leviticus 4:19-21

And all its fat he shall take from it and burn on the altar. Thus shall he do with the bull. As he did with the bull of the sin offering, so shall he do with this. And the priest shall make atonement for them, and they shall be forgiven. And he shall carry the bull outside the camp and burn it up as he burned the first bull; it is the sin offering for the assembly.