John Gill Commentary Numbers 32:34

"And the children of Gad built Dibon, and Ataroth, and Aroer," — Numbers 32:34 (ASV)

And the children of Gad built
Or rather repaired the walls and fortifications, and rebuilt houses which had been demolished in the wars with Sihon and Og; when the following places were taken by the Israelites:

Dibon, and Ataroth, and Aroer ;
the two first are mentioned in (Numbers 32:3) . Aroer was a city situated on the river Arnon, and was after this in the hands of the Moabites: Jerom says ^F17 , it was showed in his day on the top of the mountain, upon the bank of the river Arnon, which flows into the Dead sea, (Jeremiah 48:19) .

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FOOTNOTES:

• F17: De loc. Heb. fol. 87. I.