2 Chronicles 18:3, 5, 9

Ahab king of Israel said to Jehoshaphat king of Judah, “Will you go with me against Ramoth-gilead?” And he said to him, “I am as you are, and my people as your people, and we will be with you in the battle.”

Then the king of Israel assembled the prophets, four hundred men, and said to them, “Shall we go against Ramoth-gilead to battle, or shall I refrain?” And they said, “Go up, for God will give it into the hand of the king.”

Now the king of Israel and Jehoshaphat the king of Judah were sitting each on his throne, arrayed in their robes, and they were sitting at the threshing floor at the entrance of the gate of Samaria; and all the prophets were prophesying before them.