24 For the tithe of the children of Israel, which they set apart as a gift unto the LORD, I have given to the Levites for an inheritance; therefore I have said unto them: Among the children of Israel they shall have no inheritance.'
Numbers 18:24 Cross References - JPS_ASV_Byz
Numbers 18:26
26 'Moreover thou shalt speak unto the Levites, and say unto them: When ye take of the children of Israel the tithe which I have given you from them for your inheritance, then ye shall set apart of it a gift for the LORD, even a tithe of the tithe.
Malachi 3:8-10
8 Will a man rob God? Yet ye rob Me. But ye say: 'Wherein have we robbed Thee?' In tithes and heave-offerings.
9 Ye are cursed with the curse, yet ye rob Me, even this whole nation.
10 Bring ye the whole tithe into the store-house, that there may be food in My house, and try Me now herewith, saith the LORD of hosts, if I will not open you the windows of heaven, and pour you out a blessing, that there shall be more than sufficiency.