When thou art in tribulation and all these things have come upon thee, even in the latter days, if thou turn to the LORD thy God and shalt be obedient unto His voice (for the LORD thy God is a merciful God), He will not forsake thee, neither destroy thee, nor forget the covenant of thy fathers which He swore unto them.
Deuteronomy 4:30-31

And woe unto them that are with child, and to them that give suck in those days! But pray ye that your flight be not in the winter, neither on the Sabbath day. For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be. And unless those days should be shortened, there should no flesh be saved; but for the elect's sake, those days shall be shortened. Then if any man shall say unto you, `Lo, here is Christ,' or `there,' believe it not. For there shall arise false christs and false prophets and shall show great signs and wonders, insomuch that, if it were possible, they shall deceive the very elect. Behold, I have told you before. Therefore, if they shall say unto you, `Behold, He is in the desert!' go not forth; or `Behold, He is in the secret chambers!' believe it not. For as the lightning cometh out of the east and shineth even unto the west, so shall also the coming of the Son of Man be. For wheresoever the carcass is, there will the eagles be gathered together. "Immediately after the tribulation of those days shall the sun be darkened and the moon shall not give her light, and the stars shall fall from heaven and the powers of the heavens shall be shaken, and then shall appear the sign of the Son of Man in heaven. And then shall all the tribes of the earth mourn, and they shall see the Son of Man coming in the clouds of heaven with power and with great glory. And He shall send His angels with a great sound of a trumpet, and they shall gather together His elect from the four winds, from one end of heaven to the other. "Now learn a parable of the fig tree: When his branch is yet tender and putteth forth leaves, ye know that summer is nigh. So likewise ye, when ye shall see all these things, know that it is near, even at the doors. Verily I say unto you, this generation shall not pass till all these things be fulfilled. Heaven and earth shall pass away, but My Words shall not pass away. But of that day and hour, knoweth no man, no, not the angels of Heaven, but My Father only. But as the days of Noah were, so shall also the coming of the Son of Man be. For as in the days that were before the flood they were eating and drinking, marrying and giving in marriage, until the day that Noah entered into the ark and knew not until the flood came and took them all away, so shall also the coming of the Son of Man be. Then shall two be in the field; the one shall be taken and the other left. Two women shall be grinding at the mill; the one shall be taken and the other left. "Watch therefore, for ye know not what hour your Lord doth come. But know this, that if the master of the house had known in what watch the thief would come, he would have watched and would not have suffered his house to be broken into.Therefore be ye also ready, for in such an hour as ye think not, the Son of Man cometh.
Matthew 24:19-44

For in those days shall be affliction such as was not from the beginning of the creation which God created until this time, neither shall be. And except that the Lord had shortened those days, no flesh should be saved; but for the elect's sake, whom He hath chosen, He hath shortened the days. And then if any man shall say to you, `Lo, here is Christ!' or, `Lo, He is there!' believe him not; for false christs and false prophets shall rise, and shall show signs and wonders to seduce, if it were possible, even the elect. But take ye heed; 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 fall, and the powers that are in heaven shall be shaken.' 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 learn a parable of the fig tree: When her branch is yet tender and putteth forth leaves, ye know that summer is near. So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors. Verily I say unto you, that this generation shall not pass till all these things be done. Heaven and earth shall pass away, but My words shall not pass away. But of that day and that hour knoweth no man -- no, not the angels who are in Heaven, neither the Son, but only the Father. "Take ye heed, watch and pray; for ye know not when the time is. For the Son of Man is as a man taking a far journey, who left his house and gave authority to his servants, and to every man his work, and commanded the doorkeeper to watch. Watch ye therefore, for ye know not when the Master of the house cometh -- at evening, or at midnight, or at the cockcrowing, or in the morning -- lest coming suddenly, He find you sleeping. And what I say unto you, I say unto all: Watch!"
Mark 13:19-37