A.T. Robertson Commentary Matthew 24:2

"But he answered and said unto them, See ye not all these things? verily I say unto you, There shall not be left here one stone upon another, that shall not be thrown down." — Matthew 24:2 (ASV)

One stone upon another (λιθος επ λιθον). Stone upon stone. A startling prediction showing that the gloomy current of the thoughts of Jesus were not changed by their words of admiration for the temple.