Numbers 21:12

9 So Moses made a bronze serpent and set it on a pole. And if a serpent bit anyone, he would look at the bronze serpent and live.

10 And the people of Israel set out and camped in Oboth. 11 And they set out from Oboth and camped at Iye-abarim, in the wilderness that is opposite Moab, toward the sunrise. 12 From there they set out and camped in the Valley of Zered. 13 From there they set out and camped on the other side of the Arnon, which is in the wilderness that extends from 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, “Waheb in Suphah, and the valleys of the Arnon, 15 and the slope of the valleys that extends to the seat of Ar, and leans to the border of Moab.”