2 Chronicles 21:4-7

When Jehoram had ascended the throne of his father and was established, he killed all his brothers with the sword, and also some of the princes of Israel. Jehoram was thirty-two years old when he became king, and he reigned eight years in Jerusalem. And he walked in the way of the kings of Israel, as the house of Ahab had done, for the daughter of Ahab was his wife. And he did what was evil in the sight of the LORD. Yet the LORD was not willing to destroy the house of David, because of the covenant that he had made with David, and since he had promised to give a lamp to him and to his sons forever.