Jahaz
   trodden down (called also Jahaza, Josh. 13:18; Jahazah, 21:36;
   Jahzah, 1 Chr. 6:78), a town where Sihon was defeated, in the
   borders of Moab and in the land of the Ammonites beyond Jordan,
   and north of the river Arnon (Num. 21:23; Deut. 2:32). It was
   situated in the tribe of Reuben, and was assigned to the
   Merarite Levites (Josh. 13:18; 21:36). Here was fought the
   decisive battle in which Sihon (q.v.) was completely routed, and
   his territory (the modern Belka) came into the possession of
   Israel. This town is mentioned in the denunciations of the
   prophets against Moab (Isa. 15:4; Jer. 48:34).
   

Jahaz, Jahazah, quarrel; dispute