Charles Ellicott Commentary Ezekiel 25:5

"And I will make Rabbah a stable for camels, and the children of Ammon a couching-place for flocks: and ye shall know that I am Jehovah." — Ezekiel 25:5 (ASV)

Rabbah was the only important town belonging to the Ammonites. It has become literally a stable for the camels of the wandering Bedouins. In the parallel clause the “Ammonites” represent the land which they inhabit.