2 Chronicles 21:1-7

Then Jehoshaphat slept with his fathers and was buried with his fathers in the city of David, and Jehoram his son became king in his place. He had brothers, the sons of Jehoshaphat: Azariah, Jehiel, Zechariah, Azaryahu, Michael and Shephatiah. All these were the sons of Jehoshaphat king of Israel. Their father gave them many gifts of silver, gold and precious things, with fortified cities in Judah, but he gave the kingdom to Jehoram because he was the firstborn. Now when Jehoram had taken over the kingdom of his father and made himself secure, he killed all his brothers with the sword, and some of the rulers of Israel also. Jehoram was thirty-two years old when he became king, and he reigned eight years in Jerusalem. He walked in the way of the kings of Israel, just as the house of Ahab did (for Ahab’s daughter was his wife), and he did evil in the sight of the LORD. Yet the LORD was not willing to destroy the house of David because of the covenant which He had made with David, and since He had promised to give a lamp to him and his sons forever.