Leviticus 16:21-22, 26

And Aaron shall lay both his hands on the head of the live goat, and confess over it all the iniquities of the people of Israel, and all their transgressions, all their sins. And he shall put them on the head of the goat and send it away into the wilderness by the hand of a man who is in readiness. The goat shall bear all their iniquities on itself to a remote area, and he shall let the goat go free in the wilderness.

And he who lets the goat go to Azazel shall wash his clothes and bathe his body in water, and afterward he may come into the camp.