2 Chronicles 18:3-5

3King Ahab of Israel said to King Jehoshaphat of Judah, ‘Will you go with me to attack Ramoth Gilead?’ Jehoshaphat replied, ‘Yes, we should work together! Use my soldiers as if they belonged to you. My army will join with your army in the war.’

4Then Jehoshaphat said to the king of Israel, ‘Before we go to fight, we must ask the Lord what we should do.’

5So the king of Israel brought together 400 prophets. He asked them, ‘Should we attack Ramoth Gilead, or not?’ They answered, ‘Yes, go and attack it, because the God will give it to you, our king.’