Mark 13:1-4

And as he went forth out of the temple, one of his disciples saith unto him, Teacher, behold, what manner of stones and what manner of buildings! And Jesus said unto him, Seest thou these great buildings? there shall not be left here one stone upon another, which shall not be thrown down. And as he sat on the mount of Olives over against the temple, Peter and James and John and Andrew asked him privately, Tell us, when shall these things be? and what shall be the sign when these things are all about to be accomplished?