Numbers 18:11

‘Of this he shall bring near, one of every offering as a contribution to Yahweh; it shall belong to the priest who splashes the blood of the peace offerings.

‘And the priest shall offer up the fat in smoke on the altar, but the breast shall belong to Aaron and his sons.

“The breast of the wave offering, however, and the thigh of the contribution offering you may eat in a clean place, you and your sons and your daughters with you; for they have been given as a statute for you and a statute for your sons taken out of the sacrifices of the peace offerings of the sons of Israel.

‘But the sun will set, and he will be clean. And afterward he shall eat of the holy gifts, for it is his food.

“All the contributions of the holy gifts, which the sons of Israel raise up to Yahweh, I have given to you and your sons and your daughters with you, as a perpetual statute. It is an everlasting covenant of salt before Yahweh to you and your seed with you.”

“Now this shall be the legal judgment for the priests taken from the people, from those who offer a sacrifice, either an ox or a sheep: they shall give to the priest the shoulder and the two cheeks and the stomach.

Do you not know that those who perform sacred services eat the food of the temple, and those who attend regularly to the altar have their share from the altar?