Save only in the matter of Uriah - Properly speaking, this is the only flagrant fault or crime in the life of David. It was a horrible offense, or rather a whole system of offenses. See the notes on 2 Samuel 11 (note), and 2 Samuel 12 (note).

Because David did that which was right in the eyes of the Lord,.... With respect to worship: and turned not aside from anything that he commanded him all the days of his life; especially in matters of religion, nor even in his moral walk and conversation, deliberately, studiously, and with design:

save only in the matter of Uriah the Hittite; the killing of him, and other sins which led on to it, and were in connection with it; Abarbinel thinks, because the affair of Bathsheba is not mentioned, that was not reckoned to David as a sin; but no doubt it was, and is included here.

Because David did that which was right in the eyes of the LORD, and turned not aside from any thing that he commanded him all the days of his life, save only in the matter of Uriah the Hittite.

15:5 Save only - This and the like phrases are not to be understood as exclusive of every sinful action, hut only of an habitual and continued apostasy from God, as the very phrase of turning aside from God, or from his commands, doth constantly imply. And thus it is most true. For David's other sins were either sudden and transient acts, soon repented of and blotted out, as in the cases of Nabal and Achish; or, mistakes of his judgment, which was not fully convinced of the sinfulness of such actions: whereas that which concerned Uriah's wife was a designed and studied sin, long continued in, defended with a succession of other sins, presumptuous, and scandalous to his government, and to the true religion.

15:1-8 Abijam's heart was not perfect with the Lord his God; he wanted sincerity; he began well, but he fell off, and walked in all the sins of his father, following his bad example, though he had seen the bad consequences of it. David's family was continued as a lamp in Jerusalem, to maintain the true worship of God there, when the light of Divine truth was extinguished in all other places. The Lord has still taken care of his cause, while those who ought to have been serviceable thereto have lived and perished in their sins. The Son of David will still continue a light to his church, to establish it in truth and righteousness to the end of time. There are two kinds of fulfilling the law, one legal, the other by the gospel. Legal is, when men do all things required in the law, and that by themselves. None ever thus fulfilled the law but Christ, and Adam before his fall. The gospel manner of fulfilling the law is, to believe in Christ who fulfilled the law for us, and to endeavour in the whole man to obey God in all his precepts. And this is accepted of God, as to all those that are in Christ. Thus David and others are said to fulfil the law.