Leviticus 16:27-28

27But the bull of the 1sin offering and the goat of the 2sin offering, 3whose blood was brought in to make atonement in the Holy Place, shall be taken outside the camp, and they shall burn their hides, their flesh, and their refuse in the fire. 28Then the 4one who burns them shall wash his clothes and bathe his body with water; and afterward he shall come into the camp.