Leviticus 4:12-15

12that is, all the rest of the bull, he is to bring outside the camp to a clean place where the ashes are poured out, and burn it on a fire of wood. Where the ashes are poured out it shall be burned.

13‘Now if the whole congregation of Israel sins unintentionally, and the matter escapes the notice of the assembly, and they have done any one of the things which the Lord has commanded not to be done, and they become guilty;

14when the sin which they have committed becomes known, then the congregation shall offer a young bull of the herd as a sin offering and bring it before the Tent of Meeting.

15Then the elders of the congregation shall lay their hands on the head of the bull before the Lord [to transfer symbolically the congregation’s guilt to the sacrifice], and they shall kill the bull before the Lord.