The people spoke against God and Moses: "Why have you led us up from Egypt to die in the wilderness? There is no bread or water, and we detest this wretched food!"
Then the Lord sent poisonous snakes among the people, and they bit them so that many Israelites died.
References for Numbers 21:6
The people then came to Moses and said, "We have sinned by speaking against the Lord and against you. Intercede with the Lord so that He will take the snakes away from us." And Moses interceded for the people.
Then the Lord said to Moses, "Make a snake [image] and mount it on a pole. When anyone who is bitten looks at it, he will recover."
References for Numbers 21:8
So Moses made a bronze snake and mounted it on a pole. Whenever someone was bitten, and he looked at the bronze snake, he recovered.
The Israelites set out and camped at Oboth.
References for Numbers 21:10
They set out from Oboth and camped at Iye-abarim in the wilderness that borders Moab on the east.
From there they went and camped at Zered Valley.
They set out from there and camped on the other side of the Arnon [River], in the wilderness that extends from the Amorite border, because the Arnon was the Moabite border between Moab and the Amorites.
Therefore it is stated in the Book of the Lord's Wars: Waheb in Suphah and the ravines of the Arnon,
References for Numbers 21:14
even the slopes of the ravines that extend to the site of Ar and lie along the border of Moab.
References for Numbers 21:15