Numbers 21:8-12

Then the Lord said to Moses, “Make a fiery serpent, and put it on a flag pole; and it shall come about, that everyone who is bitten, and looks at it, will live.”

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.