The Lord said to Moses, “Make a poisonous snake and set it on a pole. When anyone who is bitten looks at it, he will live.”

So Moses made a bronze snake and put it on a pole, so that if a snake had bitten someone, when he looked at the bronze snake he lived.

The earth opened its mouth and swallowed them and Korah at the time that company died, when the fire consumed 250 men. So they became a warning.