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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Then the king of Israel gathered the prophets together, about four hundred men, and said to them, "Shall I go against Ramoth Gilead to battle, or shall I forbear?" They said, "Go up; for the Lord will deliver it into the hand of the king."
Thus says Yahweh of Armies, Don't listen to the words of the prophets who prophesy to you: they teach you vanity; they speak a vision of their own heart, and not out of the mouth of Yahweh.
It happened 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 Yahweh, in the presence of the priests and of all the people, saying,
Thus says Yahweh of Armies, the God of Israel, concerning Ahab the son of Kolaiah, and concerning Zedekiah the son of Maaseiah, who prophesy a lie to you in my name: Behold, I will deliver them into the hand of Nebuchadnezzar king of Babylon; and he shall kill them before your eyes;
"Beware of false prophets, who come to you in sheep's clothing, but inwardly are ravening wolves.
Beloved, don't believe every spirit, but test the spirits, whether they are of God, because many false prophets have gone out into the world.