But 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."

Genesis 19:38
The younger daughter also gave birth to a son, and she named him Ben-ammi. He is the father of the Ammonites of today.

Deuteronomy 2:9
Then the LORD said to me, "Do not harass the Moabites or provoke them to war, for I will not give you any of their land, because I have given Ar to the descendants of Lot as their possession."

Deuteronomy 2:37
But you did not go near the land of the Ammonites, or the land along the banks of the Jabbok River, or the cities of the hill country, or any place that the LORD our God had forbidden.

And when you come near over against the children of Ammon, distress them not, nor meddle with them: for I will not give you of the land of the children of Ammon any possession; because I have given it to the children of Lot for a possession.