2 Chronicles 18:1-3

Jehoshaphat enjoyed great riches and high esteem, and he made an alliance with Ahab of Israel by having his son marry Ahab’s daughter. A few years later he went to Samaria to visit Ahab, who prepared a great banquet for him and his officials. They butchered great numbers of sheep, goats, and cattle for the feast. Then Ahab enticed Jehoshaphat to join forces with him to recover Ramoth-gilead. “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.”