King James Version
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.English Standard Version
"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,New International Version
"I give to the Levites all the tithes in Israel as their inheritance in return for the work they do while serving at the Tent of Meeting.