1 Kings 22:10-12

10And the king of Israel and Jehoshaphat the king of Judah, having put on their robes, sat each on his throne, in the open place at the entrance of the gate of Samaria; and all the prophets prophesied before them.

11And Zedekiah the son of Chenaanah made for himself horns of iron, and he said, Thus saith Jehovah: With these shalt thou push the Syrians, until thou have exterminated them.

12And all the prophets prophesied so, saying, Go up to Ramoth-Gilead, and prosper; for Jehovah will give it into the king's hand.