Leviticus 4:20-21

²⁰Thus shall he do with the bullock; as he did with the bullock of the sin-offering, so shall he do with this; and the priest shall make atonement for them, and they shall be forgiven.

²¹And he shall carry forth the bullock without the camp, and burn it as he burned the first bullock: it is the sin-offering for the assembly.