Numbers 21:7-9

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.