Leviticus 16:10; Leviticus 16:22; Leviticus 16:26

10 But the goat chosen by lot as the scapegoat shall be presented alive before the LORD to be used for making atonement by sending it into the desert as a scapegoat.
22 The goat will carry on itself all their sins to a solitary place; and the man shall release it in the desert.
26 "The man who releases the goat as a scapegoat must wash his clothes and bathe himself with water; afterward he may come into the camp.