Numbers 18:22-24
New Revised Standard Version Catholic Edition
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 offenses; 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.
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