...the kingdom of heaven shall be like ten virgins, who, taking their lamps, went out to meet the groom and the bride. But five of them were foolish, and five were prudent. For the five foolish, having brought their lamps, did not take oil with them..Since the bridegroom was delayed, they all fell asleep...But in the middle of the night, a cry went out. ‘Behold, the groom  is arriving.  Go out to meet him’…But the foolish ones said to the wise, ‘Give to us from your oil, for our lamps are being extinguished.’ The prudent responded by saying, ‘Lest perhaps there may not be enough for us and for you, it would be better for you to go to the vendors and buy some for yourselves. But while they were going to buy it, the groom arrived. And those who were prepared entered with him to the wedding, and the door was closed. Yet truly at the very end the remaining virgins also arrived saying Lord, Lord, open to us.’ But he responded by saying ‘Amen I say to you, I do not know you.’ And so you must be vigilant, because you do not know the day or the hour."  Matthew 25 :1-13