II Chronicles 18:3, 5, 9

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

Then the king of Israel gathered the prophets together, four hundred men, and said to them, “Shall we go to war against Ramoth Gilead, or shall I refrain?” So they said, “Go up, for God will deliver it into the king’s hand.”

The king of Israel and Jehoshaphat king of Judah, clothed in their robes, sat each on his throne; and they sat at a threshing floor at the entrance of the gate of Samaria; and all the prophets prophesied before them.