Leviticus 6:10

7 and the priest shall make atonement for him before Yahweh; and he shall be forgiven concerning whatever he does so as to be guilty thereby.

8 Yahweh spoke to Moses, saying,

9 Command Aaron and his sons, saying, This is the law of the burnt offering: the burnt offering shall be on the hearth on the altar all night to the morning; and the fire of the altar shall be kept burning thereon.

10 The priest shall put on his linen garment, and his linen breeches shall he put on his flesh; and he shall take up the ashes whereto the fire has consumed the burnt offering on the altar, and he shall put them beside the altar.

11 He shall put off his garments, and put on other garments, and carry forth the ashes outside of the camp to a clean place.

12 The fire on the altar shall be kept burning thereon, it shall not go out; and the priest shall burn wood on it every morning: and he shall lay the burnt offering in order on it, and shall burn thereon the fat of the peace-offerings.

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