2 Chronicles 18:3-5

3“Will you go with me to Ramoth-gilead?” King Ahab of Israel asked King Jehoshaphat of Judah. Jehoshaphat replied, “Why, of course! You and I are as one, and my troops are your troops. We will certainly join you in battle.”

4Then Jehoshaphat added, “But first let’s find out what the Lord says.”

5So the king of Israel summoned the prophets, 400 of them, and asked them, “Should we go to war against Ramoth-gilead, or should I hold back?” They all replied, “Yes, go right ahead! God will give the king victory.”