Numbers 21:9-13

So Moses made a bronze serpent and put it on the flag pole; and it came about, that if a serpent bit someone, and he looked at the bronze serpent, he lived.

Now the sons of Israel moved out and camped in Oboth.

Then they journeyed from Oboth and camped at Iye-abarim, in the wilderness which is opposite Moab, to the east.

From there they set out and camped in Wadi Zered.

From there they journeyed and camped 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.