'Poisonous' in the Bible

Then the Lord sent poisonous snakes among the people, and they bit them so that many Israelites died.

Then the LORD instructed Moses, "Make a poisonous serpent out of brass and fasten it to a pole. Anyone who has been bitten and who looks at it will live."

So Moses made a bronze serpent and fastened it to a pole. If a person who had been bitten by a poisonous serpent looked to the serpent, he lived.