Mark 13:34-37

34 [It is] as [when] a man, sojourning in another country, having left his house, and given authority to his servants, to each one his work, commanded also the porter to watch.
35 Watch therefore: for ye know not when the lord of the house cometh, whether at even, or at midnight, or at cockcrowing, or in the morning;
36 lest coming suddenly he find you sleeping.
37 And what I say unto you I say unto all, Watch.
The American Standard Version is in the public domain.