Mark 13:20-23

In fact, unless the Lord shortens that time of calamity, not a single person will survive. But for the sake of his chosen ones he has shortened those days. “Then if anyone tells you, ‘Look, here is the Messiah,’ or ‘There he is,’ don’t believe it. For false messiahs and false prophets will rise up and perform signs and wonders so as to deceive, if possible, even God’s chosen ones. Watch out! I have warned you about this ahead of time!