Mark 13:6
For many will come in my name, saying, I am he, and will deceive many.
Mark 13:22
For false Christs and false prophets will arise, and will show signs and wonders, in order to lead astray, if possible, even the elect.
Matthew 24:5
For many will come in my name, saying, I am the Christ; and will deceive many.
Matthew 24:11
and many false prophets will arise, and deceive many;
Matthew 24:23-24
Then if any one shall say to you: Lo! here is the Christ, or there; believe it not.
John 5:43
I have come in my Father's name, and you receive me not; if another should come in his own name, him you would receive.
John 8:24
Therefore said I to you, that you shall die in your sins. For if you believe not that I am, He, you shall die in your sins.
Acts 5:36-39
For before these days Theudas arose, declaring himself to be some great one; to whom a number of men, about four hundred, joined themselves; and he was slain; and all, as many as believed him, were scattered and brought to naught.
1 John 4:1
Beloved, believe not every spirit; but prove the spirits, whether they are from God: for many false prophets have gone out into the world.