Leviticus 6:10-13

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

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

12The fire on the altar shall be kept burning on it; it shall not go out. The priest shall burn wood on it every morning, and he shall arrange the burnt offering on it and shall burn on it the fat of the peace offerings.

13Fire shall be kept burning on the altar continually; it shall not go out.