Therefore, behold, the days come, saith the LORD, that I will cause an alarm of war to be heard in Rabbah of the Ammonites; and it shall be a desolate heap, and her daughters shall be burned with fire: then shall Israel be heir unto them that were his heirs, saith the LORD.
Rabbah - the great, metropolis of Ammon (2 Samuel 12:26-30). Its destruction is foretold also in Ezekiel 25:5; Amos 1:14-15.
Her daughters shall be burned with fire - the towns and villages dependencies of the metropolis (Joshua 15:45).
Then shall Israel be heir unto them that were his heirs - i:e., shall possess those who possessed him. The full accomplishment of this is still future; partially fulfilled under the Maccabees (1Ma 5:6).