Numbers 21:7-9

Then the people came to Moses and cried out, “We have sinned by speaking against the LORD and against you. Pray that the LORD will take away the snakes.” So Moses prayed for the people. Then the LORD told him, “Make a replica of a poisonous snake and attach it to a pole. All who are bitten will live if they simply look at it!” So Moses made a snake out of bronze and attached it to a pole. Then anyone who was bitten by a snake could look at the bronze snake and be healed!