Matthew 25:13
"Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh."
Cross References (ranked by relevance)
Behold, I come as a thief. Blessed is he that watcheth, and keepeth his garments, lest he walk naked, and they see his shame.
Therefore let us not sleep, as do others; but let us watch and be sober.
Watch ye therefore, and pray always, that ye may be accounted worthy to escape all these things that shall come to pass, and to stand before the Son of man.
Watch ye, stand fast in the faith, quit you like men, be strong.
Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour:
The lord of that servant shall come in a day when he looketh not for him, and in an hour that he is not aware of,
But watch thou in all things, endure afflictions, do the work of an evangelist, make full proof of thy ministry.
Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.
But the end of all things is at hand: be ye therefore sober, and watch unto prayer.