Matthew 24:21-25

21For then shall be great tribulation, such as hath not been since the beginning of the world to this time, no, nor ever shall be. 22And except those days should be shortened, there should no flesh be saved: but for the elect’s sake those days shall be shortened. 23Then if any man shall say to you, Lo, here is Christ, or there; believe it not. 24For false Christs will arise, and false prophets, and shall show great signs and wonders; so that, if it were possible, they would deceive the very elect. 25Behold, I have told you before.