"Now learn a parable of the fig tree; When his branch is yet tender, and putteth forth leaves, ye know that summer is nigh:So likewise ye, when ye shall see all these things, know that it is near, even at the doors.Verily I say unto you, This generation shall not pass, till all these things be fulfilled.Heaven and earth shall pass away, but my words shall not pass away"
Matthew 24:32-35