II Chronicles 6:14-17 NKJV
and he said: “LORD God of Israel, there is no God in heaven or on earth like You, who keep Your covenant and mercy with Your servants who walk before You with all their hearts. You have kept what You promised Your servant David my father; You have both spoken with Your mouth and fulfilled it with Your hand, as it is this day. Therefore, LORD God of Israel, now keep what You promised Your servant David my father, saying, ‘You shall not fail to have a man sit before Me on the throne of Israel, only if your sons take heed to their way, that they walk in My law as you have walked before Me.’ And now, O LORD God of Israel, let Your word come true, which You have spoken to Your servant David.
NKJV: New King James Version