John Gill's  Exposition of the Bible 

Joshua 21:36

And out of the tribe of Reuben, Bezer with her suburbs, and Jahazah with her suburbs,

And out of the tribe of Reuben, Bezer with her suburbs,.... Which was a city of refuge, and the fifth of them in this account, though not observed as such here, but is in the Greek version; see

Joshua 20:8;

and Jahazah with her suburbs; called Jahaz, See Gill on "Numbers 21:23".