Mark 13:31

So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors.

Verily I say unto you, that this generation shall not pass, till all these things be done.

But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father.

Take ye heed, watch and pray: for ye know not when the time is.