Numbers 21:4-7

4Then they traveled from Mount Hor by the road to the Red Sea, to go around the land of Edom, but the people became impatient along the way.

5And the people spoke against God and against Moses, “Why have you brought us up out of Egypt to die in the wilderness, for there is no bread or water, and we detest this worthless food.”

6So the Lord sent poisonous snakes among the people, and they bit the people; many people of Israel died.

7Then the people came to Moses and said, “We have sinned, for we have spoken against the Lord and against you. Pray to the Lord that he would take away the snakes from us.” So Moses prayed for the people.