1 Kings 22:2-6
22:2 In the third year King Jehoshaphat of Judah came down to visit the king of Israel.
22:3 The king of Israel said to his servants, “Surely you recognize that Ramoth Gilead belongs to us, though we are hesitant to reclaim it from the king of Syria.”
22:4 Then he said to Jehoshaphat, “Will you go with me to attack Ramoth Gilead?” Jehoshaphat replied to the king of Israel, “I will support you; my army and horses are at your disposal.”
22:5 Then Jehoshaphat added, “First seek an oracle from the Lord.”
22:6 So the king of Israel assembled about four hundred prophets and asked them, “Should I attack Ramoth Gilead or not?” They said, “Attack! The sovereign one will hand it over to the king.”