Ezekiel 21:20 - Matthew Poole's English Annotations on the Holy Bible

This royal city of the Ammonites, it seems, the king of Babylon had a quarrel with, as well as with Jerusalem, and he was resolved, when he came out of Babylon, to set upon one of them. There were two or three cities of this name Rabba, or Rabbath; one in the tribe of Judah, one in Issachar, one in Moab; but this in the text is distinguished by Rabbath of the Ammonites. The Ammonites were the children of Lot's daughter by incestuous mixture. To Judah i.e. the Jews, the land for the people of the land. In Jerusalem; particularly against Jerusalem, whose fortifications do now as little discourage as they shall ere long hinder Nebuchadnezzar from taking the city and destroying it