Mark 13:36

34For 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.

35Watch 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:

36Lest coming suddenly he find you sleeping.

37And what I say unto you I say unto all, Watch.