Leviticus 6:10-14

The priest is to put on his linen robe, and he shall put on linen undergarments next to his body; and he shall take up the fatty 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 fatty 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.

‘Now this is the law of the grain offering: the sons of Aaron shall present it before the Lord in front of the altar.