Numbers 21:6-9

The LORD sent fiery serpents among the people and they bit the people, so that many people of Israel died. So the people came to Moses and said, “We have sinned, because we have spoken against the LORD and you; intercede with the LORD, that He may remove the serpents from us.” And Moses interceded for the people. Then the LORD said to Moses, “Make a fiery serpent, and set it on a standard; and it shall come about, that everyone who is bitten, when he looks at it, he will live.” And Moses made a bronze serpent and set it on the standard; and it came about, that if a serpent bit any man, when he looked to the bronze serpent, he lived.