Numbers 18:23

But the Levites shall do the service of the tabernacle of the congregation, and they shall bear their iniquity: it shall be a statute for ever throughout your generations, that among the children of Israel they have no inheritance.

Cross-reference

Numbers 18:20 tells Aaron he has no inheritance; here the same applies to Levites—both share God as inheritance.

Numbers 3:7 describes Levites performing duties at the tent—same role as the work mentioned here.

Deuteronomy 12:12 repeats that Levites have no allotment or inheritance, directly echoing this verse's statement.

Joshua 18:7 explicitly states Levites have no share because priestly service is their inheritance—a direct parallel.