Leviticus 6:8-13

8And Jehovah spoke to Moses, saying,

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

10And the priest shall put on his linen raiment, and his linen breeches shall he put on his flesh, and take up the ashes to which the fire hath consumed the burnt-offering on the altar, and he shall put them beside the altar.

11And he shall put off his garments, and put on other garments, and carry forth the ashes without the camp unto a clean place.

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

13A continual fire shall be kept burning on the altar: it shall never go out.