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 said Jehoshaphat unto the king of Israel, - Seek, I pray thee, at once, the word of Yahweh. So the king of Israel gathered together the prophets, about four hundred men, and said unto them - Shall I go against Ramoth-gilead, to battle, or shall I forbear? And they said - Go up, that the Lord may deliver it into the hand of the king.
Thus, saith Yahweh of hosts, - Do not hearken unto the words of the prophets who are prophesying unto you, They are filling you, with vain hopes, - The vision of their own hearts, do they speak, Not from the mouth of Yahweh!
And it came to pass in that year, in the beginning of the reign of Zedekiah king of Judah, in the fourth year in the fifth month, that Hananiah son of Azzur the prophet who was of Gibeon, spake unto me, in the house of Yahweh, before the eyes of the priests and all the people, saying:
Thus, saith Yahweh of hosts, God of Israel Concerning Ahab son of Kolaiah, and concerning Zedekiah son of Maaseiah, who are prophesying to you in my name, a falsehood, Behold me! delivering them into the hand of Nebuchadrezzar king of Babylon, and he will smite them before your eyes:
Beware of false prophets, who come unto you in clothing of sheep, - while, within, they are ravening wolves.
Beloved! not in every spirit, believe ye, but test the spirits, whether they are, of God; because, many false prophets, have gone out into the world.