Ammonites: Israelites Forbidden to Disturb
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Deuteronomy 2:19, 37
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.” / 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.