Deuteronomy 2:9

2:9 Then the Lord said to me, “Do not harass Moab and provoke them to war, for I will not give you any of their land as your territory. This is because I have given Ar16 to the descendants of Lot17 as their possession.

16	sn Ar was a Moabite city on the Arnon River east of the Dead Sea. It is mentioned elsewhere in the “Book of the Wars of Yahweh” (Num 21:15; cf. 21:28; Isa 15:1). Here it is synonymous with the whole land of Moab.
17	sn The descendants of Lot. Following the destruction of the cities of the plain, Sodom and Gomorrah, as God’s judgment, Lot fathered two sons by his two daughters, namely, Moab and Ammon (Gen 19:30–38). Thus, these descendants of Lot in and around Ar were the Moabites.