Leviticus 6:10-13

10And the priest shall put on his linen robe and linen undergarments, and he shall remove from the altar the ashes of the burnt offering that the fire has consumed and place them beside it. 11Then he must take off his garments, put on other clothes, and carry the ashes outside the camp to a ceremonially clean place.

12The fire on the altar shall be kept burning; it must not be extinguished. Every morning the priest is to add wood to the fire, arrange the burnt offering on it, and burn the fat portions of the peace offerings on it. 13The fire shall be kept burning on the altar continually; it must not be extinguished.