Matthew 24:5, 23-25

For many will come in my name, saying, ‘I am the Christ,’ and they will lead many astray.

Then if anyone says to you, ‘Look, here is the Christ!’ or ‘There he is!’ do not believe it. For false christs and false prophets will arise and perform great signs and wonders, so as to lead astray, if possible, even the elect. See, I have told you beforehand.