Numbers 21:14 in the King James Version
Wherefore it is said in the book of the wars of the LORD, What he did in the Red sea, and in the brooks of Arnon,
Context
13 From there they traveled, 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 the LORD, “Vaheb in Suphah, the valleys of the Arnon,
15 the slope of the valleys that incline toward the dwelling of Ar, leans on the border of Moab.”