Numbers 21
5 Ref And crying out against God and against Moses, they said, Why have you taken us out of Egypt to come to our death in the waste land? For there is no bread and no water, and this poor bread is disgusting to us.
6 Ref Then the Lord sent poison-snakes among the people; and their bites were a cause of death to numbers of the people of Israel.
7 Ref 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.
8 Ref 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.
9 Ref So Moses made a snake of brass and put it on a rod; and anyone who had a snakebite, after looking on the snake of brass, was made well.