2 I am going the way of all the earth: so be strong and be a man; 3 And keep the orders of the Lord your God, walking in his ways, keeping his laws and his orders and his rules and his words, as they are recorded in the law of Moses; so that you may do well in all you do and wherever you go, 4 So that the Lord may give effect to what he said of me, If your children give attention to their ways, living uprightly before me with all their heart and their soul, you will never be without a man to be king in Israel.
Matthew Henry's Commentary on 1 Kings 2:2-4
Commentary on 1 Kings 2:1-4
(Read 1 Kings 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.