'False Prophets' in the Bible

"Look out for false prophets, who come to you under the guise of sheep, but inside they are devouring wolves.

Many false prophets will appear and mislead many people;

for false Christs and false prophets will announce themselves, and they will show great signs and wonders to mislead, if possible, God's chosen people.

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.

A curse on you when everyone speaks well of you, for this is the way their forefathers used to treat the false prophets.

Now there were false prophets among the people, just as there will be false teachers among you too, who will insidiously introduce destructive heresies and deny the Master who has bought them, thus bringing on themselves swift destruction.

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.