Matthew 24:33

30 and then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming on the clouds of heaven with power and great glory.

31 And he shall send forth 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.

32 Now from the fig tree learn her parable: when her branch is now become tender, and putteth forth its leaves, ye know that the summer is nigh;

33 even so ye also, when ye see all these things, know ye that he is nigh, [even] at the doors.

34 Verily I say unto you, This generation shall not pass away, till all these things be accomplished.

35 Heaven and earth shall pass away, but my words shall not pass away.

36 But of that day and hour knoweth no one, not even the angels of heaven, neither the Son, but the Father only.