Leviticus 6:10-11

10And the priest shall put on his linen raiment, and his linen breeches shall he put on his flesh, and take up the ashes to which the fire hath consumed the burnt-offering on the altar, and he shall put them beside the altar.

11And he shall put off his garments, and put on other garments, and carry forth the ashes without the camp unto a clean place.