1 Kings 2:3-4

3Do the job the Lord your God has assigned you by following his instructions and obeying his rules, commandments, regulations, and laws as written in the law of Moses. Then you will succeed in all you do and seek to accomplish,

4and the Lord will fulfill his promise to me, ‘If your descendants watch their step and live faithfully in my presence with all their heart and being, then,’ he promised, ‘you will not fail to have a successor on the throne of Israel.’