Leviticus 4:20-21

20He shall also do with the bull just as he did with 1the bull of the sin offering; he shall do the same with it. So 2the priest shall make atonement for them, and they will be forgiven. 21Then he is to bring the bull out to a place outside the camp and burn it just as he burned the first bull; it is 3the sin offering for the assembly.