Numbers 18:22-24

New Revised Standard Version, Anglicised

²² From now on the Israelites shall no longer approach the tent of meeting, or else they will incur guilt and die. ²³ But the Levites shall perform the service of the tent of meeting, and they shall bear responsibility for their own offences; it shall be a perpetual statute throughout your generations. But among the Israelites they shall have no allotment, ²⁴ because I have given to the Levites as their portion the tithe of the Israelites, which they set apart as an offering to the Lord. Therefore I have said of them that they shall have no allotment among the Israelites.