1 Kings 22:3-4, 6

During the visit, the king of Israel said to his officials, “Do you realize that the town of Ramoth-gilead belongs to us? And yet we’ve done nothing to recapture it from the king of Aram!” Then he turned to Jehoshaphat and asked, “Will you join me in battle to recover Ramoth-gilead?” Jehoshaphat replied to the king of Israel, “Why, of course! You and I are as one. My troops are your troops, and my horses are your horses.”

So the king of Israel summoned the prophets, about 400 of them, and asked them, “Should I go to war against Ramoth-gilead, or should I hold back?” They all replied, “Yes, go right ahead! The Lord will give the king victory.”