Leviticus 6:8-13

⁸Then the Lord spoke to Moses, saying, ⁹“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. ¹⁰The 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. 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, 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. ¹³Fire shall be kept burning continually on the altar; it is not to go out.