Moses made a bronze snake and placed it on a pole. If a snake bit someone, that person could look at the bronze snake and live.
Then the Israelites marched and they camped at Oboth.
References for Numbers 21:10
They marched from Oboth and camped at Iye-abarim in the desert on the border of Moab toward the east.
From there they marched and camped in the Zered ravine.
From there they marched and camped across the Arnon in the desert that extends from the border of the Amorites, for the Arnon was the border of Moab, between Moab and the Amorites.
For this reason the scroll of the LORD's wars says: Waheb in Suphah and the ravines. The Arnon
and the ravines that extend to the settlement of Ar and lie along the border of Moab.
From there they marched to Beer, the well where the LORD said to Moses, "Gather the people, and I'll give them water."
Then the Israelites sang this song: "Well, flow up! Sing about it!
The well that the officials dug, that the officials of the people hollowed out with the ruler's scepter and their staffs." They marched from the desert to Mattanah;
from Mattanah to Nahaliel; from Nahaliel to Bamoth;