Joshua 21:33 KJV
All the cities of the Gershonites according to their families were thirteen cities with their suburbs.
Joshua 21:33, King James Version
In context
32 And out of the tribe of Naphtali, Kedesh in Galilee with her suburbs, to be a city of refuge for the slayer; and Hammoth–dor with her suburbs, and Kartan with her suburbs; three cities.
33 All the cities of the Gershonites according to their families were thirteen cities with their suburbs.
34 And unto the families of the children of Merari, the rest of the Levites, out of the tribe of Zebulun, Jokneam with her suburbs, and Kartah with her suburbs,