Mark 13:6
Many will come bearing the name of Messiah, and saying, 'I am He,' and they will mislead many.
Mark 13:22
For false Christs and false prophets will announce themselves, and they will do signs and wonders to mislead, if possible, even God's chosen people.
Matthew 24:5
for many will come bearing the name of the Messiah, and saying, 'I am the Christ,' and will mislead many people.
Matthew 24:11
Many false prophets will appear and mislead many people;
Matthew 24:23-24
"If anyone at that time says to you, 'Here is the Christ!' or 'There He is!' do not believe it,
John 5:43
I have come in my Father's name, but you refuse to accept me. If anyone else should come in his own name, you would accept him.
John 8:24
So I have told you that you would die under the curse of your sins, for unless you believe that I am the Christ, you will die under the curse of your sins."
Acts 5:36-39
For in the days gone by Theudas appeared, claiming that he was a man of importance, and a considerable number of men, about four hundred, espoused his cause, but he was slain and all his followers were dispersed and as a party annihilated.
1 John 4:1
Dearly beloved, stop believing every so-called spiritual utterance, but keep testing them to see whether they come from God, because many false prophets have gone out into the world.