Jeremiah 48:19

Aroer was a city in the lot of Gad and Reuben, Numbers 32:34. In David's time it was in the hand of the Jews, 1 Samuel 30:28, but in Isaiah's time it belonged to Syria, Isaiah 17:2, and here it is reckoned to the Moabites. The inhabitants of it are called to stand by the way, and seeing the Moabites fleeing, to ask what news. Others think that Aroer was at this time a city of the Ammonites, and here called unto to see their neighbours the Moabites fleeing before their enemies.