Matthew 24:31-35

And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.

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.