2 Chronicles 18:2-3

2Then after some years, he went down to visit Ahab in Samaria. Ahab slaughtered many sheep, goats, and cattle for him and for the people who were with him, and he persuaded him to attack Ramoth-gilead,

3for Israel’s King Ahab asked Judah’s King Jehoshaphat, “Will you go with me to Ramoth-gilead?” He replied to him, “I am as you are, my people as your people; we will be with you in the battle.”