For I have kept the ways of Jehovah. He had spoken in the preceding verse of the cleanness of his hands, but finding that men judged of him perversely, and were very active in spreading evil reports concerning him, he affirms that he had kept the ways of the Lord, which is equivalent to his appealing the matter to the judgment-seat of God. Hypocrites, it is true, are accustomed confidently to appeal to God in the same way; yea, there is nothing which they are more forward in doing than in dallying with the sacred name of God, and making it a cover to conceal their hypocrisy; but David brings forward nothing which men might not have certainly known to be true, if any regard to justice had existed among them. Let us, therefore, from his example, endeavor above all things to have a good conscience. And, in the second place, let us have the magnanimity to despise the false judgments of men, and to look up to heaven for the vindicator of our character and cause. He adds, I have not wickedly departed from my God This implies, that he always aimed directly at the mark of his calling, although the ungodly attempted many things to overthrow his faith. The verb which he uses does not denote one fall only, but a defection which utterly removes and alienates a man from God. David, it is true, sometimes fell into sin through the weakness of the flesh, but he never desisted from following after godliness, nor deserted the service to which God had called him.

For I have kept the ways of the Lord - I have obeyed his laws. I have not so violated the laws which God has given to regulate my conduct with my fellow-men as to deserve to be treated by them as a guilty man.
And have not wickedly departed from my God - "I have not been a sinner from my God;" an apostate; an open violator of his law. The treatment which I have received, though it would be justly rendered to an open violator of law, is not that which I have merited from the hand of man.

I have kept the ways of the Lord - I was neither an infidel nor a profligate; I trusted in God, and carefully observed all the ordinances of his religion.

For I have kept the ways of the Lord,.... Not those which the Lord himself walks in, his ways of providence, or of grace; though these are and should be taken notice of and observed by good men, as the word (y) used will bear to be rendered; but the ways which he has prescribed and directed men to walk in, the ways of his commandments, in which they should go; these were, in some measure, kept by David, who often, in the hundred nineteenth psalm speaks of his keeping the testimonies and statutes, and commandments of the Lord; as they are by good men, with some degree of pleasure, they take delight to walk in them; and with some degree of constancy, they keep walking in them, without turning to the right hand or the left, though solicited to it; but yet not perfectly, for they have many a slip and fall in them; wherefore this cannot be a reason of their being rewarded according to their righteousness: in strict justice, the words better agree with Christ, who kept the law of God perfectly, did his will completely; he came from heaven to do it; it was his meat and drink to accomplish it; and he always did the things which pleased his father, wherefore he rewarded him;
and have not wickedly departed from my God; which was, in some sense, true of David; not as by disbelieving the power and providence, the promises, truth, and faithfulness of God, and his covenant interest in him; which to do would have been a wicked departure from God; see Hebrews 3:12; nor by forsaking the house and worship of God; though he was driven from thence by wicked men, yet sore against his will, and which during his exile he frequently laments and complains of; nor by sinning wilfully and presumptuously, only through error, inadvertency, infirmity, and temptation: but when it is observed, how much unbelief, which is a partial departing from the living God, and how many there are that neglect private and public worship, and what a proneness there is to sin and wickedness, and how much there is of the will in sinful actions, in the best of men; it is right and best to understand this of Christ, who never was guilty of sin, nor committed any wickedness in departing from God in the least: as man, God was his God, and he always believed his interest in him, and claimed it even when he forsook him on the cross; nor did he quit his service, desert his cause, nor depart from the work and business he enjoined him, till it was finished.
(y) "observaveram", Tigurine version, Vatablus; "observo", Junius & Tremellius; "observavi", Gejerus, Michaelis; so Ainsworth.