Leviticus 6:12-16

The fire on the altar shall be kept burning on it. It shall not go out, but the priest shall burn wood on it every morning; and he shall lay out the burnt offering on it, and offer up in smoke the fat portions of the peace offerings on it.

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

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

Then one of them shall lift 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 soothing aroma, as its memorial offering to the Lord.

And Aaron and his sons are to eat what is left of it. It shall be eaten as unleavened cakes in a holy place; they are to eat it in the courtyard of the tent of meeting.