Reference: Prophets, False
Morish
These, at various periods in the history of Israel, appeared in large numbers: Ahab had 'about four hundred' of them. 1Ki 22:6. Such are described as speaking "a vision of their own heart, and not out of the mouth of the Lord." Jer 23:16. There were three that opposed Jeremiah to his face
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And the king of Israel assembled the prophets, about four hundred men, and said to them, Shall I go against Ramoth-Gilead to battle, or shall I forbear? And they said, Go up, and the Lord will give it into the king's hand.
Thus saith Jehovah of hosts: Hearken not unto the words of the prophets that prophesy unto you: they lead you to vanity; they speak a vision of their own heart, not out of the mouth of Jehovah.
And it came to pass the same year, in the beginning of the reign of Zedekiah king of Judah, in the fourth year, in the fifth month, that Hananiah the son of Azzur, the prophet, who was of Gibeon, spoke to me in the house of Jehovah, in the presence of the priests and of all the people, saying,
Thus saith Jehovah of hosts, the God of Israel, concerning Ahab the son of Kolaiah, and concerning Zedekiah the son of Maaseiah, who prophesy falsehood unto you in my name: Behold, I will give them into the hand of Nebuchadrezzar king of Babylon, and he shall smite them before your eyes.
But beware of false prophets, which come to you in sheep's clothing, but within are ravening wolves.
Beloved, believe not every spirit, but prove the spirits, if they are of God; because many false prophets are gone out into the world.