Leviticus 6:14-18

‘Now this is the law of the grain offering: the sons of Aaron shall present it before the LORD in front of the altar. One 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. What 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. [1 Cor 9:13, 14] It shall not be baked with leaven [which represents corruption or sin]. I have given it as their share of My offerings by fire; it is most holy, like the sin offering and the guilt offering. Every male among the sons of Aaron may eat it [as his share]; it is a permanent ordinance throughout your generations, from offerings by fire to the LORD. Whatever touches them will become consecrated (ceremonially clean).’ ”