The Parable of the Ten Virgins
AND the foolish said unto the wise, Give us of your oil; for our lamps are gone out. But the wise answered, saying, Not so; lest there be not enough for us and you: but go ye rather to them that sell, and buy for yourselves. And while they went to buy, the bridegroom came; and they that were ready went in with him to the marriage: and the door was shut. Afterward came also the other virgins, saying, Lord, Lord, open to us. But he answered and said, Verily I say unto you, I know you not.
Watch therefore, for ye know neither the day nor the hour wherein the Son of man cometh.*
* ‘Son of man’ could mean several things, including just ‘I/me’, but in the context of some future advent many well-read Jewish listeners would think of the prophecy of Daniel in Daniel 7:13-14.