2 Kings 8:16-22

Now in the fifth year of Joram (Jehoram) the son of Ahab king of Israel, when Jehoshaphat was king of Judah, Jehoram the son of Jehoshaphat king of Judah became king. He was thirty-two years old when he became king, and he reigned for eight years in Jerusalem. He walked in the ways of the kings of Israel, just as the house of Ahab had done, for [Athaliah] the daughter of Ahab became his wife. He did evil in the sight of the LORD. Yet for the sake of His servant David the LORD was not willing to destroy Judah, since He had promised to give him a lamp (enthroned descendant) through his sons always. In his days Edom revolted from the rule of Judah, and set up a king over themselves. So Jehoram [king of Judah] went over to Zair [in Edom] with all his chariots. He set out by night and struck down the Edomites who had surrounded him and the captains of his chariots; but the people [of his army] fled to their tents. So Edom revolted against Judah to this day. Then Libnah revolted at the same time.