Mark 13:1-4

As He was coming out of the temple [grounds], one of His disciples said to Him, “Teacher, look what wonderful stones and what wonderful buildings!” [Matt 24; Luke 21:5-36] Jesus replied to him, “You see these great buildings? Not one stone will be left on another which will not be torn down!” As He was sitting on the Mount of Olives opposite the temple, Peter and James and John and Andrew asked Him privately, “Tell us, when will these things happen, and what will be the sign when all these things are about to be fulfilled?”