Numbers 18:21,24
And, behold, I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve, even the service of the tabernacle of the congregation.
Torrey's Topical Textbook—AKJV

Nehemiah 10:37
And that we should bring the first fruits of our dough, and our offerings, and the fruit of all manner of trees, of wine and of oil, to the priests, to the chambers of the house of our God; and the tithes of our ground to the Levites, that the same Levites might have the tithes in all the cities of our tillage.
Torrey's Topical Textbook—AKJV