2 Kings 18:19-21

19Then the Rabshakeh said to them, “Say to Hezekiah, ‘Thus says the great king, the king of Assyria, “What is [the reason for] this confidence that you have?

20You say (but they are only empty words) ‘I have counsel and strength for the war.’ Now on whom do you rely, that you have rebelled against me?

21Now pay attention: you are relying on Egypt, on that staff of crushed reed; if a man leans on it, it will only go into his hand and pierce it. So is Pharaoh king of Egypt to all who trust and rely on him.