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
At Jahaz, Israel’s journey nearly came to a halt. Moses asked King Sihon for safe passage, but Sihon “gathered all his people together, and went out against Israel,” and the two armies fought there. Moses retells the event in Deuteronomy 2, and Jephthah recalls it in Judges 11. The town, also spelled Jahazah, later appears among the cities of Reuben and of the Levites, and Isaiah 15 hears its cry in a sorrowful word about Moab. Numbers 21 is the best place to begin.
6 verses
Numbers
And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness: and he came to Jahaz, and fought against Israel.
Deuteronomy
Then Sihon came out against us, he and all his people, to fight at Jahaz.
Joshua
And Jahazah, and Kedemoth, and Mephaath,
And out of the tribe of Reuben, Bezer with her suburbs, and Jahazah with her suburbs,
Judges
But Sihon trusted not Israel to pass through his coast: but Sihon gathered all his people together, and pitched in Jahaz, and fought against Israel.
Isaiah
And Heshbon shall cry, and Elealeh: their voice shall be heard even unto Jahaz: therefore the armed soldiers of Moab shall cry out; his life shall be grievous unto him.
From Easton's Bible Dictionary
Matthew George Easton, 1897