Numbers 21:5-8

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, there is no water, and our soul loathes this disgusting food!” The LORD sent venomous snakes among the people, and they bit the people. Many people of Israel died. The people came to Moses, and said, “We have sinned, because we have spoken against the LORD and against you. Pray to the LORD, that he take away the serpents from us.” Moses prayed for the people. The LORD said to Moses, “Make a venomous snake, and set it on a pole. It shall happen that everyone who is bitten, when he sees it, shall live.”