Mark 13:1-4

And as he came out of the temple, one of his disciples said to him, “Look, Teacher, what wonderful stones and what wonderful buildings!” And Jesus said to him, “Do you see these great buildings? There will not be left here one stone upon another that will not be thrown down.” And as he sat on the Mount of Olives opposite the temple, Peter and James and John and Andrew asked him privately, “Tell us, when will these things be, and what will be the sign when all these things are about to be accomplished?”