Commentaries
2:1-4 David's charge to Solomon is, to keep the charge of the Lord. The authority of a dying father is much, but nothing to that of a living God. God promised David that the Messiah should come from his descendants, and that promise was absolute; but the promise, that there should not fail of them a man on the throne of Israel, was conditional; if he walks before God in sincerity, with zeal and resolution: in order hereunto, he must take heed to his way.
4. there shall not fail thee … a man on the throne of Israel—a reference to the promise made to David of the sovereignty being vested perpetually in his lineage (2Sa 7:11-16), which was confirmed to Solomon afterwards (see 1Ki 9:5), and repeated with reference to its spiritual meaning long after (Jer 33:17).