Numbers 21:13-15

Amplified Bible, Classic Edition

¹³ From there they journeyed and encamped on the other side of [the river] Arnon, which is in the desert or wilderness that extends from the frontier of the Amorites; for [the river] Arnon is the boundary of Moab, between Moab and the Amorites.

¹⁴ That is why it is said in the Book of the Wars of the Lord: Waheb in Suphah, and the valleys of [the branches of] the Arnon [River],

¹⁵ And the slope of the valleys that stretch toward the site of Ar and find support on the border of Moab.