If anyone says to you then, 'Look, here is the Messiah!' or, 'There he is!' do not believe it. False messiahs and false prophets will arise, and they will perform signs and wonders so great as to deceive, if that were possible, even the elect. Behold, I have told it to you beforehand. So if they say to you, 'He is in the desert,' do not go out there; if they say, 'He is in the inner rooms,' do not believe it. For just as lightning comes from the east and is seen as far as the west, so will the coming of the Son of Man be.
(Matthew 24:23-27 NAB)