Numbers 21:9-13

And Moses made a serpent of brass, and put it upon a pole, and it came to pass, that if a serpent had bitten any man, when he beheld the serpent of brass, he lived.

And the children of Israel set forward, and pitched in Oboth.

And they journeyed from Oboth, and pitched at Ije-abarim, in the wilderness which is before Moab, toward the sunrising.

From thence they removed, and pitched in the valley of Zared.

From thence they removed, and pitched on the other side of Arnon, which is in the wilderness that cometh out of the coasts of the Amorites: for Arnon is the border of Moab, between Moab and the Amorites.