10 (these were for the descendants of Aaron who were from the families of the Kohathite branch of Levi because the first lot fell to them): 11 Kiriath Arba (Arba was the ancestor of Anak), that is, Hebron, in the hills of Judah, with access to the pastures around it. 12 The fields of the city and its open lands they had already given to Caleb son of Jephunneh as his possession.
Matthew Henry's Commentary on Joshua 21:10-12
Commentary on Joshua 21:9-42
(Read Joshua 21:9-42)
By mixing the Levites with the other tribes, they were made to see that the eyes of all Israel were upon them, and therefore it was their concern to walk so that their ministry might not be blamed. Every tribe had its share of Levites' cities. Thus did God graciously provide for keeping up religion among them, and that they might have the word in all parts of the land. Yet, blessed be God, we have the gospel more diffused amongst us.