Numbers 5:9

And it shall be Aaron's and his sons' by a statute for ever from the children of Israel: for it is an heave offering: and it shall be an heave offering from the children of Israel of the sacrifice of their peace offerings, even their heave offering unto the LORD.

It shall not be baked with leaven. I have given it unto them for their portion of my offerings made by fire; it is most holy, as is the sin offering, and as the trespass offering.

Every male among the priests shall eat thereof: it shall be eaten in the holy place: it is most holy. As the sin offering is, so is the trespass offering: there is one law for them: the priest that maketh atonement therewith shall have it. And the priest that offereth any man's burnt offering, even the priest shall have to himself the skin of the burnt offering which he hath offered. And all the meat offering that is baked in the oven, and all that is dressed in the frying pan, and in the pan, shall be the priest's that offereth it. And every meat offering, mingled with oil, and dry, shall all the sons of Aaron have, one as much as another. And this is the law of the sacrifice of peace offerings, which he shall offer unto the LORD. If he offer it for a thanksgiving, then he shall offer with the sacrifice of thanksgiving unleavened cakes mingled with oil, and unleavened wafers anointed with oil, and cakes mingled with oil, of fine flour, fried. Besides the cakes, he shall offer for his offering leavened bread with the sacrifice of thanksgiving of his peace offerings. And of it he shall offer one out of the whole oblation for an heave offering unto the LORD, and it shall be the priest's that sprinkleth the blood of the peace offerings.

And ye shall eat it in the holy place, because it is thy due, and thy sons' due, of the sacrifices of the LORD made by fire: for so I am commanded.

Speak unto Aaron and to his sons, that they separate themselves from the holy things of the children of Israel, and that they profane not my holy name in those things which they hallow unto me: I am the LORD.

And the LORD spake unto Aaron, Behold, I also have given thee the charge of mine heave offerings of all the hallowed things of the children of Israel; unto thee have I given them by reason of the anointing, and to thy sons, by an ordinance for ever.