1 Kings 22:10-12

And the king of Israel and Jehoshaphat the king of Judah sat each on his throne, having put on their robes, in a void place in the entrance of the gate of Samaria; and all the prophets prophesied before them. And Zedekiah the son of Chenaanah made him horns of iron: and he said, Thus saith the LORD, With these shalt thou push the Syrians, until thou have consumed them. And all the prophets prophesied so, saying, Go up to Ramoth-gilead, and prosper: for the LORD shall deliver it into the king's hand.