Deuteronomy 2:18

And the slope of the wadis That extends to the site of Ar, And leans to the border of Moab.”

“Then Yahweh said to me, ‘Do not harass Moab, nor provoke them to war, for I will not give you any of their land as a possession because I have given Ar to the sons of Lot as a possession.’

‘Then they went through the wilderness and around the land of Edom and the land of Moab and came to the east toward the sunrise of the land of Moab, and they camped beyond the Arnon; but they did not enter the territory of Moab, for the Arnon was the border of Moab.