Mark 13:19-23

19for at that time there will be such tribulation as has not occurred, from the beginning of the creation which God made, until now—and never will [be again].

20And if the Lord had not shortened the days, no human life would have been saved; but for the sake of the elect, whom He chose [for Himself], He shortened the days.

21Then if anyone says to you, ‘Look, here is the Christ (the Messiah, the Anointed)!’ or, ‘Look, He is there!’ do not believe it;

22for false Christs and false prophets will arise, and they will provide signs and wonders in order to deceive, if [such a thing were] possible, even the elect [those God has chosen for Himself].

23But be on your guard; I have told you everything in advance.