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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So the king of Israel gathered the prophets, about 400 men, and asked them, "Should I go against Ramoth-gilead for war or should I refrain?" They replied, "March up, and the Lord will hand it over to the king."
This is what the Lord of Hosts says: "Do not listen to the words of the prophets who prophesy to you. They are making you worthless. They speak visions from their own minds, not from the Lord's mouth.
In that same year, at the beginning of the reign of Zedekiah king of Judah, in the fifth month of the fourth year, the prophet Hananiah son of Azzur from Gibeon said to me in the temple of the Lord in the presence of the priests and all the people,
This is what the Lord of Hosts, the God of Israel, says to Ahab son of Kolaiah and to Zedekiah son of Maaseiah, the ones prophesying a lie to you in My name: "I am about to hand them over to Nebuchadnezzar king of Babylon, and he will kill them before your very eyes.
"Beware of false prophets who come to you in sheep's clothing but inwardly are ravaging wolves.
Dear friends, do not believe every spirit, but test the spirits to determine if they are from God, because many false prophets have gone out into the world.