Numbers 18:21-24

“Behold, I have given the children of Levi all the tithes in Israel as an inheritance in return for the work which they perform, the work of the tabernacle of meeting. Hereafter the children of Israel shall not come near the tabernacle of meeting, lest they bear sin and die. But the Levites shall perform the work of the tabernacle of meeting, and they shall bear their iniquity; it shall be a statute forever, throughout your generations, that among the children of Israel they shall have no inheritance. For the tithes of the children of Israel, which they offer up as a heave offering to the LORD, I have given to the Levites as an inheritance; therefore I have said to them, ‘Among the children of Israel they shall have no inheritance.’ ”