Leviticus 16:21-22, 26

He will lay both of his hands on the goat’s head and confess over it all the wickedness, rebellion, and sins of the people of Israel. In this way, he will transfer the people’s sins to the head of the goat. Then a man specially chosen for the task will drive the goat into the wilderness. As the goat goes into the wilderness, it will carry all the people’s sins upon itself into a desolate land.

“The man chosen to drive the scapegoat into the wilderness of Azazel must wash his clothes and bathe himself in water. Then he may return to the camp.