34 And to the families of the children of Merari, the rest of the Levites, from the tribe of Zebulun, Jokneam with its common-land, Kartah with its common-land, 35 Dimnah with its common-land, and Nahalal with its common-land: four cities; 36 and from the tribe of Reuben, Bezer with its common-land, Jahaz with its common-land, 37 Kedemoth with its common-land, and Mephaath with its common-land: four cities; 38 and from the tribe of Gad, Ramoth in Gilead with its common-land (a city of refuge for the slayer), Mahanaim with its common-land, 39 Heshbon with its common-land, and Jazer with its common-land: four cities in all. 40 So all the cities for the children of Merari according to their families, the rest of the families of the Levites, were by their lot twelve cities.
Matthew Henry's Commentary on Joshua 21:34-40
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.