Mark 13:19-23

because those will be days of distress unequalled from the beginning, when God created the world, until now – and never to be equalled again. ‘If the Lord had not cut short those days, no-one would survive. But for the sake of the elect, whom he has chosen, he has shortened them. At that time if anyone says to you, “Look, here is the Messiah!” or, “Look, there he is!” do not believe it. For false messiahs and false prophets will appear and perform signs and wonders to deceive, if possible, even the elect. So be on your guard; I have told you everything in advance.