2 Chronicles 18:3
And Ahab king of Israel said to Jehoshaphat king of Judah, Will you go with me to Ramothgilead? And he answered him, I am as you are, and my people as your people; and we will be with you in the war.
Torrey's Topical Textbook—AKJV

2 Chronicles 19:2
And Jehu the son of Hanani the seer went out to meet him, and said to king Jehoshaphat, Should you help the ungodly, and love them that hate the LORD? therefore is wrath on you from before the LORD.
Torrey's Topical Textbook—AKJV

2 Chronicles 20:35-37
And after this did Jehoshaphat king of Judah join himself with Ahaziah king of Israel, who did very wickedly:
Torrey's Topical Textbook—AKJV