“King Jehoshaphat had great riches and honor. He made a marriage alliance with King Ahab. After some years he went down to King Ahab in Samaria. King Ahab slaughtered an abundance of sheep and oxen for him and for the people who were with him. He induced him to go up against Ramoth-gilead. King Ahab of Israel said to King Jehoshaphat of Judah. ‘Will you go with me to Ramoth-gilead?’ He answered him. ‘I am with you. My people are your people. We will be with you in the war.’”
Now we are back to following 1 Kings, chapter 22. There appears to be a truce with northern Israel as King Jehoshaphat of Judah made a marriage alliance with King Ahab of Israel. His son Jehoram, who would be king after him, married Athaliah, the daughter of King Ahab. This biblical author does not explain it like in 1 Kings. Thus it looks like there is going to be reconciliation between Judah and Israel. The king of Judah went to Samaria, which was the capital of Israel. There they sacrificed sheep and oxen, which would have been against the idea of all sacrifices at Jerusalem. King Ahab induced King Jehoshaphat to go with him to take back Ramon-gilead which was on the east side of the Jordan River. King Jehoshaphat responded that he was in complete agreement. He and his people were at their disposal. It seems like King Jehoshaphat is a little dependent on King Ahab, despite all his great military power.