Leviticus 6:12-16

12And the fire on 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 on it; and he shall burn on it the fat of the peace offerings.

13A fire shall always be burning on the altar; it shall never go out.

14‘This is the law of the grain offering: The sons of Aaron shall offer it on the altar before the Lord.

15He shall take from it his handful of the fine flour of the grain offering, with its oil, and all the frankincense which is on the grain offering, and shall burn it on the altar for a sweet aroma, as a memorial to the Lord.

16And the remainder of it Aaron and his sons shall eat; with unleavened bread it shall be eaten in a holy place; in the court of the tabernacle of meeting they shall eat it.