Mark 13:32-36

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.

For the Son of man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch.

Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:

Lest coming suddenly he find you sleeping.