Leviticus 16:25

23“Aaron shall come into the Tent of Meeting, and shall take off the linen garments which he put on when he went into the Holy Place, and shall leave them there.

24Then he shall bathe himself in water in a holy place, put on his garments, and come out and offer his burnt offering and the burnt offering of the people, and make atonement for himself and for the people.

25The fat of the sin offering he shall burn on the altar.

26“He who lets the goat go as the scapegoat shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp.

27The bull for the sin offering, and the goat for the sin offering, whose blood was brought in to make atonement in the Holy Place, shall be carried outside the camp; and they shall burn their skins, their flesh, and their dung with fire.