Numbers 21:4-6

4They travelled from Mount Hor along the route to the Sea of Reeds in order to go around the land of Edom. The spirit of the people became impatient along the way.

5The people spoke against God and Moses: “Why have you brought us from Egypt to die in the wilderness, because there is no bread, no water, and our very spirits detest the despicable food?

6So Adonai sent poisonous serpents among the people, and they bit the people and many of the people of Israel died.