Every one shall live.

In the biblical story, following their Exodus from Egypt, the Israelites set out from Mount Hor, where Aaron was buried, to go to the Red Sea. However they had to detour around the land of Edom (Numbers 20:21, 25). Impatient, they complained against Yehovah and Moses (Num. 21:4–5), and in response God sent "fiery serpents" among them and many died.
The people came to Moses to repent and asked him to ask God to take away the serpents. Moses prayed to God, who told Moses, 'Make thee a fiery serpent, and set it upon a pole; and it shall come to pass, that every one that is bitten, when he seeth it, shall live.' (Numbers 21:4–9)