The Ammonites: Jewish Laws Respecting: Not to be Distressed
Source: TTT
Deuteronomy 2:19
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.”
2 Chronicles 20:10
And now, here are the men of Ammon, Moab, and Mount Seir, whom You did not let Israel invade when they came out of the land of Egypt; but Israel turned away from them and did not destroy them.