Mark 13:21 KJV
And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not:
Mark 13:21, King James Version
In context
20 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.
21 And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not:
22 For false Christs and false prophets shall rise, and shall shew signs and wonders, to seduce, if it were possible, even the elect.