Ar — The chief city of the Moabites, here put for the whole country which depended upon it. The children of Lot — So called to signify that this preservation, was not for their sakes, for they were a wicked people, but for Lot's sake whose memory God yet honours.
Related Commentaries of Deuteronomy 2:9
Deuteronomy 2:9
9 And the LORD said unto me, Distressb not the Moabites, neither contend with them in battle: for I will not give thee of their land for a possession; because I have given Ar unto the children of Lot for a possession.