Numbers 21:13-15 - WEB
13
From there they journeyed, and encamped on the other side of the Arnon, which is in the wilderness, that comes out of the border of the Amorites: for the Arnon is the border of Moab, between Moab and the Amorites.
14
Therefore it is said in the book of the Wars of Yahweh, Vaheb in Suphah, The valleys of the Arnon,
15
The slope of the valleys That inclines toward the dwelling of Ar, Leans on the border of Moab.
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