St Mark 13:21-37

And then if any man shall say to you, Lo, here is Christ; lo, he is here: do not believe. For there will rise up false Christs and false prophets, and they shall shew signs and wonders, to seduce (if it were possible) even the elect. Take you heed therefore; behold I have foretold you all things. But in those days, after that tribulation, the sun shall be darkened, and the moon shall not give her light. And the stars of heaven shall be falling down, and the powers that are in heaven, shall be moved. And then shall they see the Son of man coming in the clouds, with great power and glory. And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven. Now of the fig tree learn ye a parable. When the branch thereof is now tender, and the leaves are come forth, you know that summer is very near. So you also when you shall see these things come to pass, know ye that it is very nigh, even at the doors. Amen I say to you, that this generation shall not pass, until all these things be done. Heaven and earth shall pass away, but my word shall not pass away. But of that day or hour no man knoweth, neither the angels in heaven, nor the Son, but the Father. Take ye heed, watch and pray. For ye know not when the time is. Even as a man who going into a far country, left his house; and gave authority to his servants over every work, and commanded the porter to watch. Watch ye therefore, (for you know not when the lord of the house cometh: at even, or at midnight, or at the cockcrowing, or in the morning,) Lest coming on a sudden, he find you sleeping. And what I say to you, I say to all: Watch.