Matthew 24:

23 “Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There!’ do not believe it.
24 For false christs and false prophets will rise and show great signs and wonders to deceive, if possible, even the elect.
25 See, I have told you beforehand.

26 “Therefore if they say to you, ‘Look, He is in the desert!’ do not go out; or ‘Look, He is in the inner rooms!’ do not believe it.
27 For as the lightning comes from the east and flashes to the west, so also will the coming of the Son of Man be.