Joshua 21:1

Cities with their suburbs are assigned for the priests and Levites.

1And the leaders of the families of Levi approached Eleazar, the priest, and Joshua, the son of Nun, and the rulers of the extended families of each of the tribes of the sons of Israel.
21:1Israel was ordered by family relations, with smaller and larger groups according to how closely they were related, which might be rendered something like: family, extended family, tribe, Israel.(Conte)
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