Azazel

Aaron shall cast lots for the two goats; one lot for the LORD, and the other lot for the scapegoat.

But the goat, on which the lot fell for the scapegoat, shall be presented alive before the LORD, to make atonement for him, to send him away for the scapegoat into the wilderness.

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