Numbers 21:14

12From there they traveled, and encamped in the valley of Zered.

13From 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.

14Therefore it is said in The Book of the Wars of the LORD , “Vaheb in Suphah, the valleys of the Arnon,

15the slope of the valleys that incline toward the dwelling of Ar, leans on the border of Moab.”

16From there they traveled to Beer; that is the well of which the LORD said to Moses, “Gather the people together, and I will give them water.”