2 Chronicles 18:1-3
1-3But even though Jehoshaphat was very rich and much honored, he made a marriage alliance with Ahab of Israel. Some time later he paid a visit to Ahab at Samaria. Ahab celebrated his visit with a feast—a huge barbecue with all the lamb and beef you could eat. But Ahab had a hidden agenda; he wanted Jehoshaphat's support in attacking Ramoth Gilead. Then Ahab brought it into the open: "Will you join me in attacking Ramoth Gilead?" Jehoshaphat said, "You bet. I'm with you all the way; you can count on me and my troops."
4Then Jehoshaphat said, "But before you do anything, ask God for guidance."