Leviticus 16:26

And he shall wash his flesh with water in the holy place, and put on his garments, and come forth, and offer his burnt offering, and the burnt offering of the people, and make an atonement for himself, and for the people.

And the fat of the sin offering shall he burn upon the altar.

And the bullock [for] the sin offering, and the goat [for] the sin offering, whose blood was brought in to make atonement in the holy [place], shall [one] carry forth without the camp; and they shall burn in the fire their skins, and their flesh, and their dung.

And he that burneth them shall wash his clothes, and bathe his flesh in water, and afterward he shall come into the camp.