Leviticus 21:22

22He may eat the bread of his God, both of athe most holy and of the bholy things,

Numbers 18:11-19

11This also is yours: the contribution of their gift, all the cwave offerings of the people of Israel. I have given them to dyou, and to your sons and daughters with you, as a perpetual due. eEveryone who is clean in your house may eat it. 12 fAll the best of the oil and all the best of the wine and of the grain, gthe firstfruits of what they give to the Lord, I give to you. 13The first ripe fruits of all that is in their land, hwhich they bring to the Lord, shall be yours. iEveryone who is clean in your house may eat it. 14 jEvery devoted thing in Israel shall be yours. 15 kEverything that opens the womb of all flesh, whether man or beast, which they offer to the Lord, shall be yours. Nevertheless, lthe firstborn of man you shall redeem, and the firstborn of unclean animals you shall redeem. 16And their redemption price m(at a month old you shall redeem them) you shall fix at five shekels
A  shekel was about 2/5 ounce or 11 grams
in silver, according to the shekel of the sanctuary, owhich is twenty gerahs.
17 pBut the firstborn of a cow, or the firstborn of a sheep, or the firstborn of a goat, you shall not redeem; they are holy. You shall sprinkle their blood on the altar and shall burn their fat as a food offering, with a pleasing aroma to the Lord. 18But their flesh shall be yours, as qthe breast that is waved and as the right thigh are yours. 19 rAll the holy contributions that the people of Israel present to the Lord I give to you, and to your sons and daughters with you, as a perpetual due. sIt is a covenant of salt forever before the Lord for you and for your offspring with you.”

Deuteronomy 18:3-4

3And this shall be the priestsdue from the people, from those offering a sacrifice, whether an ox or a sheep: tthey shall give to the priest the shoulder and the two cheeks and the stomach. 4 uThe firstfruits of your grain, of your wine and of your oil, and the first fleece of your sheep, you shall give him.

1 Corinthians 9:4

4 vDo we not have the right to eat and drink?

1 Corinthians 9:13-14

13Do you not know that wthose who are employed in the temple service get their food from the temple, and those who serve at the altar share in the sacrificial offerings? 14In the same way, the Lord commanded that xthose who proclaim the gospel should get their living by the gospel.

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