Numbers 21:6-9

Then the LORD sent fiery (burning) serpents among the people; and they bit the people, and many Israelites died. So 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. Then the LORD said to Moses, “Make a fiery serpent [of bronze] and set it on a pole; and everyone who is bitten will live when he looks at it.” So Moses made a serpent of bronze and put it on the pole, and it happened that if a serpent had bitten any man, when he looked to the bronze serpent, he lived.