'False Prophets' in the Bible

But beware of false prophets, which come to you in sheep's clothing, but within are ravening wolves.

and many false prophets shall arise and shall mislead many;

For there shall arise false Christs, and false prophets, and shall give great signs and wonders, so as to mislead, if possible, even the elect.

For false Christs and false prophets will arise, and give signs and wonders to deceive, if possible, even the elect.

Woe, when all men speak well of you, for after this manner did their fathers to the false prophets.

But there were false prophets also among the people, as there shall be also among you false teachers, who shall bring in by the bye destructive heresies, and deny the master that bought them, bringing upon themselves swift destruction;

Beloved, believe not every spirit, but prove the spirits, if they are of God; because many false prophets are gone out into the world.