Joshua 21:34-40

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, Dimnah with its common-land, and Nahalal with its common-land: four cities; and from the tribe of Reuben, Bezer with its common-land, Jahaz with its common-land, Kedemoth with its common-land, and Mephaath with its common-land: four cities; 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, Heshbon with its common-land, and Jazer with its common-land: four cities in all. 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.