Deuteronomy 2:19-37

when thou comest nigh over against the children of Ammon, distress them not, nor meddle with them—The Ammonites, being kindred to the Moabites, were, from regard to the memory of their common ancestor, to remain undisturbed by the Israelites. The territory of this people had been directly north from that of Moab. It extended as far as the Jabbok, having been taken by them from a number of small Canaanitish tribes, namely, the Zamzummins, a bullying, presumptuous band of giants, as their name indicates; and the Avims, the aborigines of the district extending from Hazerim or Hazeroth (El Hudhera) even unto Azzah (Gaza), but of which they had been dispossessed by the Caphtorim (Philistines), who came out of Caphtor (Lower Egypt) and settled in the western coast of Palestine. The limits of the Ammonites were now compressed; but they still possessed the mountainous region beyond the Jabbok (Joshua 11:2). What a strange insight does this parenthesis of four verses give into the early history of Palestine! How many successive wars of conquest had swept over its early state—what changes of dynasty among the Canaanitish tribes had taken place long prior to the transactions recorded in this history!