2 Chronicles 18:1

Now Jehoshaphat had riches and honour in abundance
Still more and more, see ( 2 Chronicles 17:5 ) , and which moved Ahab to desire friendship and affinity with him, to which Jehoshaphat agreed:

and joined affinity with Ahab;
king of Israel, married his son Joram to Athaliah, a daughter of Ahab by Jezebel of Zidon; which marriage proved of bad consequence to Jehoshaphat and his family.