Leviticus 6:12-16

12The fire on the altar shall be kept burning; it shall not [be allowed to] go out. The priest shall burn wood on it every morning, and he shall arrange the burnt offering on it and offer the fat portions of the peace offerings up in smoke on it.

13The fire shall be burning continually on the altar; it shall not [be allowed to] go out.

14‘Now this is the law of the grain offering: the sons of Aaron shall present it before the Lord in front of the altar.

15One of them shall take up from it a handful of the fine flour of the grain offering with its oil and all the incense that is on the grain offering, and he shall offer it up in smoke on the altar, a sweet and soothing aroma, as the memorial offering to the Lord.

16What is left of it Aaron and his sons are to eat. It shall be eaten as unleavened bread in a holy place; they are to eat it in the courtyard of the Tent of Meeting.