Read Numbers 18:21 Using Other Translations
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.
"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,
As for the tribe of Levi, your relatives, I will compensate them for their service in the Tabernacle. Instead of an allotment of land, I will give them the tithes from the entire land of Israel.