Leviticus 16:27-28

27But the bull of the sin offering and the goat of the sin offering, 1whose 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 2one who burns them shall wash his clothes and bathe his body with water, then afterward he shall come into the camp.