19 However, Hashem refrained from destroying Yehuda, for the sake of His servant David, in accordance with His promise to maintain a lamp for his descendants for all time.
8:19 To maintain a lamp for his descendants for all time
Hashem is not yet ready to destroy Yehuda, due to the promise that He had made to King David to give him an eternal kingdom. The Hebrew word used for ‘kingdom’ in this verse is nir (ניר), which can also mean a ‘light’ or a ‘lamp,’ from the word ner (נר), which means ‘candle.’ The kingdom of David is intended to give eternal light to the entire Nation of Israel, and by extension the entire world. Even in the absence of a kingdom, the knowledge that Hashem will eventually return the monarchy to David through the Mashiach is a source of light and hope to all.