Mark 13:20-23

And if the Lord had not cut short the days, no human being would be saved. But for the sake of the elect, whom he chose, he shortened the days. And then if anyone says to you, ‘Look, here is the Christ!’ or ‘Look, there he is!’ do not believe it. For false christs and false prophets will arise and perform signs and wonders, to lead astray, if possible, the elect. But be on guard; I have told you all things beforehand.