Leviticus 6:8-13

Then the LORD spoke to Moses, saying, “Command Aaron and his sons, saying, ‘This is the law for the burnt offering: the burnt offering itself shall remain on the hearth on the altar all night until the morning, and the fire on the altar is to be kept burning on it. The priest is to put on his linen robe, and he shall put on undergarments next to his flesh; and he shall take up the ashes to which the fire reduces the burnt offering on the altar and place them beside the altar. Then he shall take off his garments and put on other garments, and carry the ashes outside the camp to a clean place. The fire on the altar shall be kept burning on it. It shall not go out, but the priest shall burn wood on it every morning; and he shall lay out the burnt offering on it, and offer up in smoke the fat portions of the peace offerings on it. Fire shall be kept burning continually on the altar; it is not to go out.