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 gathered the prophets, about four hundred men, and said to them, Shall I go against Ramoth in Gilead to battle, or shall I hold back? And they said, Go up! For Jehovah shall deliver it into the hand of the king.
So says Jehovah of Hosts, Do not listen to the words of the prophets who prophesy to you. They make you vain; they speak a vision from their own heart, not out of the mouth of Jehovah.
And it happened in that year, in the beginning of the reign of Zedekiah king of Judah, in the fourth year, in the fifth month, Hananiah the son of Azur the prophet, of Gibeon, spoke to me in the house of Jehovah, in the presence of the priests and of all the people, saying,
so says Jehovah of Hosts, the God of Israel, about Ahab the son of Kolaiah and of 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 they are ravening wolves.
Beloved, do not believe every spirit, but try the spirits to see if they are of God, because many false prophets have gone out into the world.