“Yet the LORD was not willing to destroy Judah, for the sake of David his servant” (v19). Jehoram, king of Judah, “did evil in the sight of the Lord,” just like many of northern Israel’s kings (he was married to wicked Ahab’s daughter, v18). While the land of Judah suffered under this sinful king, God promised not to wipe them out completely; Jehoram was David’s descendent, and God had promised David that his family would continue and be part of the salvation of the world.
“He promised to give a lamp to him and to his sons forever” (v19). Even when the people rebelled, God remembered His covenant. God’s mercy and faithfulness are far greater than our sins.