Leviticus 6:12-16

12The fire that is on the altar must never stop burning. Every morning the priest must put wood on it. He must also put on it the gifts and the fat of the friendship offerings.

13The fire must always burn. It must not go out.

14These are the rules for the gift of grain. Aaron's sons must bring it in front of the altar to give to the Lord.

15A priest must take some of the flour and oil. He must mix this special part with incense and he must burn all of it on the altar. The smell of them while they are burning will give the Lord pleasure.

16The priests will make into bread the flour that he did not burn. They must not use yeast to make the bread. They must eat the bread in a holy place, in the yard outside the Tent of Meeting.