Numbers 21:4-7

The Israelites left Mount Hor and went on the road toward the Red Sea, in order to go around the country of Edom. But the people became impatient on the way and grumbled at God and Moses. They said, “Why did you bring us out of Egypt to die in this desert? There is no bread and no water, and we hate this terrible food!” So the LORD sent them poisonous snakes; they bit the people, and many of the Israelites died. The people came to Moses and said, “We sinned when we grumbled at you and the LORD. Pray that the LORD will take away these snakes.” So Moses prayed for the people.