Leviticus 6:12-14

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.

14And this is the law of the oblation: [one of] the sons of Aaron shall present it before Jehovah, before the altar.