Deuteronomy 2:16-22

16Now when all the fighting men among the people had died, 17the LORD said to me, 18“Today you are going to cross the border of Moab at Ar. 19But when you get close to the Ammonites, do not harass them or provoke them, for I will not give you any of the land of the Ammonites. I have given it to the descendants of Lot as their possession.”

20(That too was regarded as the land of the Rephaim, who used to live there, though the Ammonites called them Zamzummites. 21They were a people great and many, as tall as the Anakites. But the LORD destroyed them from before the Ammonites, who drove them out and settled in their place, 22just as He had done for the descendants of Esau who lived in Seir, when He destroyed the Horites from before them. They drove them out and have lived in their place to this day.