The same day he gave them a sign, saying, This is the sign which the Lord has given: See, the altar will be broken and the burned waste on it overturned.
Then the king, hearing the man of God crying out against the altar at Beth-el, put out his hand from the altar, saying, Take him prisoner. And his hand, stretched out against him, became dead, and he had no power of pulling it back.
Then Moses and Aaron went in to Pharaoh and they did as the Lord had said: and Aaron put his rod down on the earth before Pharaoh and his servants, and it became a snake.
And this will be the sign to you, says the Lord, that I will give you punishment in this place, so that you may see that my words will certainly have effect against you for evil: