Leviticus 6:8-11

8Then the Lord spoke to Moses, saying,

9“Command Aaron and his sons, saying, ‘This is the law of the burnt offering: The burnt offering shall be on the hearth upon the altar all night until morning, and the fire of the altar shall be kept burning on it.

10And the priest shall put on his linen garment, and his linen trousers he shall put on his body, and take up the ashes of the burnt offering which the fire has consumed on the altar, and he shall put them beside the altar.

11Then he shall take off his garments, put on other garments, and carry the ashes outside the camp to a clean place.