Leviticus 6:12-14

12The fire on the altar is to be kept burning; it must not go out. Every morning the priest will burn wood on the fire. He is to arrange the burnt offering on the fire and burn the fat portions from the fellowship offerings on it.

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

14“Now this is the law of the grain offering: Aaron’s sons will present it before the Lord in front of the altar.