Leviticus 4:20-21

²⁰'And he hath done to the bullock as he hath done to the bullock of the sin-offering, so he doth to it; and the priest hath made atonement for them, and it hath been forgiven them;

²¹and he hath brought out the bullock unto the outside of the camp, and hath burned it as he hath burned the first bullock; it is a sin-offering of the assembly.