Now, behold, you trust upon the staff of this bruised reed, even upon Egypt, on which if a man lean, it will go into his hand, and pierce it: so is Pharaoh king of Egypt unto all that trust in him.
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George Leo Haydock
Pierce it. He alludes to the reeds which grow on the Nile. See Delrio, adag. 210. Egypt had been already greatly harassed in the expedition of Sennacherib, so that no succour could be expected thence. (Calmet)