Numbers 21:4-7

4Then they set out from Mount Hor by the way of the [branch of the] Red Sea [called the Gulf of Aqabah], to go around the land of Edom; and the people became impatient, because [of the challenges] of the journey.

5So the people spoke against God and against Moses, “Why have you brought us out of Egypt to die in the wilderness? For there is no bread, nor is there any water, and we loathe this miserable food.”

6Then the Lord sent fiery (burning) serpents among the people; and they bit the people, and many Israelites died.

7So the people came to Moses, and said, “We have sinned, for we have spoken against the Lord and against you; pray to the Lord, so that He will remove the serpents from us.” So Moses prayed for the people.