'Snakes' in the Bible

Then the Lord sent poison-snakes among the people; and their bites were a cause of death to numbers of the people of Israel.

Then the people came to Moses and said, We have done wrong in crying out against the Lord and against you: make prayer to the Lord to take away the snakes from us. So Moses made prayer for the people.

And the Lord said to Moses, Make an image of a snake and put it on a rod, and anyone who has been wounded by the snakes, looking on it will be made well.