2 Kings 3:7
And he went and sent to Jehoshaphat the king of Judah, saying, The king of Moab hath rebelled against me: wilt thou go with me against Moab to battle? And he said, I will go up: I am as thou art, my people as thy people, and my horses as thy horses.
Cross-reference
2 Kings 8:28 shows Ahaziah again allying with Jehoram of Israel—a later repeat of this same alliance pattern.
1 Kings 22:4 uses the identical phrasing — 'I am as you are, my people as your people' — when Ahab asks Jehoshaphat for an alliance.
2 Chronicles 18:3 repeats the same alliance request and response, mirroring the wording of Jehoshaphat's agreement to join the war.
In 2 Chronicles 19:2, Jehu rebukes Jehoshaphat for helping the wicked—this same alliance with Ahab's house that leads to trouble.
2 Chronicles 22:10-12 records Athaliah's massacre—the ultimate consequence of mixing with Ahab's line.
1 Kings 22:32 shows Jehoshaphat nearly killed because he was mistaken for Israel's king — a danger from allying with a northern king.
2 Chronicles 18:29-30 recounts Ahab's disguise and the threat to Jehoshaphat — a later consequence of his willingness to ally with Israel's king.
In 2 Chronicles 22:3, Ahaziah follows Ahab's ways because his mother Athaliah—consequence of Jehoshaphat's alliance.
2 Chronicles 22:4 says Ahaziah's counselors from Ahab's house led him evil—another fallout of the alliance with Israel.
1 Kings 22:33 continues the same battle scene: the chariot commanders stop pursuing Jehoshaphat, highlighting the perils of his alliance.