1 Kings 2:3-4

3Keep the charge of the Lord your God, [that is, fulfill your obligation to] walk in His ways, keep His statutes, His commandments, His precepts, and His testimonies, as it is written in the Law of Moses, so that you may succeed in everything that you do and wherever you turn,

4so that the Lord may fulfill His promise concerning me, saying, ‘If your sons are careful regarding their way [of life], to walk before Me in truth with all their heart and mind and with all their soul, you shall not fail to have a man (descendant) on the throne of Israel.’