Leviticus 27:30-33

30 aEvery tithe of the land, whether of the seed of the land or of the fruit of the trees, is the Lord’s; it is holy to the Lord. 31If a man wishes to redeem some of his tithe, he shall add a fifth to it. 32And every tithe of herds and flocks, every tenth animal of all that bpass under the herdsman’s staff, shall be holy to the Lord. 33One shall not differentiate between good or bad, cneither shall he make a substitute for it; and if he does substitute for it, then both it and the substitute shall be holy; it shall not be redeemed.”

Numbers 18:8-21

8Then the Lord spoke to Aaron, “Behold, dI have given you charge of the contributions made to me, all the consecrated things of the people of Israel. I have given them to you eas a portion and to your sons as a perpetual due. 9This shall be yours of the most holy things, reserved from the fire: every offering of theirs, every grain offering of theirs and every fsin offering of theirs and every gguilt offering of theirs, which they render to me, shall be most holy to you and to your sons. 10In a most holy place shall you eat it. Every male may eat it; it is holy to you. 11This also is yours: the contribution of their gift, all the hwave offerings of the people of Israel. I have given them to iyou, and to your sons and daughters with you, as a perpetual due. jEveryone who is clean in your house may eat it. 12 kAll the best of the oil and all the best of the wine and of the grain, lthe firstfruits of what they give to the Lord, I give to you. 13The first ripe fruits of all that is in their land, mwhich they bring to the Lord, shall be yours. nEveryone who is clean in your house may eat it. 14 oEvery devoted thing in Israel shall be yours. 15 pEverything that opens the womb of all flesh, whether man or beast, which they offer to the Lord, shall be yours. Nevertheless, qthe firstborn of man you shall redeem, and the firstborn of unclean animals you shall redeem. 16And their redemption price r(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, twhich is twenty gerahs.
17 uBut 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 vthe breast that is waved and as the right thigh are yours. 19 wAll 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. xIt is a covenant of salt forever before the Lord for you and for your offspring with you.” 20And the Lord said to Aaron, “You shall have no inheritance in their land, neither shall you have any portion among them. yI am your portion and your inheritance among the people of Israel.

21 z“To the Levites I have given every tithe in Israel for an inheritance, in return for their service that they do, their service in the tent of meeting,

Numbers 18:26-28

26“Moreover, you shall speak and say to the Levites, ‘When you take from the people of Israel the tithe that I have given you from them for your inheritance, then you shall present a contribution from it to the Lord, aaa tithe of the tithe. 27 abAnd your contribution shall be counted to you as though it were the grain of the threshing floor, and as the fullness of the winepress. 28So you shall also present a contribution to the Lord from all your tithes, which you receive from the people of Israel. And from it you shall give the Lord’s contribution to Aaron the priest.

2 Chronicles 31:16

16except those enrolled by genealogy, males from three years old and upwardall who entered the house of the Lord acas the duty of each day required—for their service according to their offices, by their divisions.

Malachi 3:8-10

8Will man rob God? Yet you are robbing me. adBut you say, ‘How have we robbed you?’ aeIn your tithes and contributions. 9 afYou are cursed with a curse, for you are robbing me, the whole nation of you. 10 agBring the full tithe into the storehouse, that there may be food in my house. And thereby ahput me to the test, says the Lord of hosts, if I will not open aithe windows of heaven for you and pour down for you a blessing until there is no more need.
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