Jesus told of the destruction of Jerusalem, and even narrowed down the time to the generation then living,

“Now learn this parable from the fig tree: When its branch has already become tender, and puts forth leaves, you know that summer is near. So you also, when you see these things happening, know that it is near—at the doors! Assuredly, I say to you, this generation will by no means pass away till all these things take place. Heaven and earth will pass away, but My words will by no means pass away” (Mark 13:28–31).

Sure enough, it happened during that generation, just as He had said that it would, even promising that His word was so sure, that it would have.