2 Chronicles 18:3-5

18:3 King Ahab of Israel 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 is at your disposal and will support you in battle.” 18:4 Then Jehoshaphat added, “First seek an oracle from the Lord.” 18:5 So the king of Israel assembled 400 prophets and asked them, “Should we attack Ramoth Gilead or not?” They said, “Attack! God will hand it over to the king.”