| Barnes' Notes on the Bible Turn away my reproach - The reproach which is likely to come upon me from being a professed worshipper of God. In all ages good men have been exposed to this reproach. Which I fear - Which I have reason to apprehend will come upon me. This may not mean that he was personally afraid of it, but merely that he had reason to apprehend that he was exposed to it. The prayer is proper, for there is nothing which our nature makes us shrink back from more than reproach. Compare Psalm 119:22; Psalm 69:9, Psalm 69:20; Romans 15:3; 2 Corinthians 12:10. The word repreach in the original is the same which denotes shame or dishonor. For thy judgments are good - Thy statutes; thy laws. I know they are good. I feel that I desire to obey them. I pray, therefore, that obedience on my part to that which is good may not subject me to shame; that people may see that thy laws are good, and that it is not a matter of reproach to obey them.
Clarke's Commentary on the BibleTurn away my reproach, which I fear - This may be understood of the reproach which a man may meet with in consequence of living a godly life, for such a life was never fashionable in any time or country. But I have found the following note on the passage: "I have done a secret evil; my soul is sorry for it: if it become public, it will be a heavy reproach to me. O God, turn it away, and let it never meet the eye of man!" - Anon.
Gill's Exposition of the Entire BibleTurn away my reproach which I fear,.... Either for the sake of religion, which was disagreeable to him; and he might be afraid it would be too heavy for him to bear, and be a temptation to him to forsake the good ways of God: or rather by reason of sin, which brings a reproach on good men; and causes the enemy to speak reproachfully, and is therefore dreaded by them who desire to be kept from sin, for that reason as well as others; see Psalm 39:8. Jarchi and Kimchi think that David has some reference to his sins, in the case of Uriah and Bathsheba; lest they should be a perpetual reproach on his name and family, which he greatly feared; for thy judgments are good; the laws of God, and punishment of sin according to them; the Scriptures, and the doctrines contained in them; the ways of God, and true religion; which are evil spoken of, through the sins of the professors of them.
Geneva Study BibleTurn away {e} my reproach which I fear: for thy judgments are good. (e) Let me not fall to your dishonour but let my heart still delight in your gracious word.
Wesley's Notes 119:39 I fear - For my instability in thy ways; which in respect to my own weakness, I have great cause to fear.
Jamieson-Fausset-Brown Bible Commentary39, 40. Our hope of freedom from the reproach of inconsistency is in God's power, quickening us to live according to His Word, which He leads us to love. for thy judgments are good-The time must therefore be at hand when Thy justice will turn the "reproach" from Thy Church upon the world (Isa 25:8; 66:5; Zep 2:8-10).
Matthew Henry's Concise Commentary119:33-40 Teach me thy statutes, not the mere words, but the way of applying them to myself. God, by his Spirit, gives a right understanding. But the Spirit of revelation in the word will not suffice, unless we have the Spirit of wisdom in the heart. God puts his Spirit within us, causing us to walk in his statutes. The sin here prayed against is covetousness. Those that would have the love of God rooted in them, must get the love of the world rooted out; for the friendship of the world is enmity with God. Quicken me in thy way; to redeem time, and to do every duty with liveliness of spirit. Beholding vanity deadens us, and slackens our pace; a traveller must not stand gazing upon every object that presents itself to his view. The promises of God's word greatly relate to the preservation of the true believer. When Satan has drawn a child of God into worldly compliances, he will reproach him with the falls into which he led him. Victory must come from the cross of Christ. When we enjoy the sweetness of God's precepts, it will make us long for more acquaintance with them. And where God has wrought to will, he will work to do.
Matthew Henry's Whole Bible CommentaryVerse 39 Here, 1. David prays against reproach, as before, v. 22. David was conscious to himself that he had done that which might give occasion to the enemies of the Lord to blaspheme, which would blemish his own reputation and turn to the dishonour of his family; now he prays that God, who has all men's hearts and tongues in his hands, would be pleased to prevent this, to deliver him from all his transgressions, that he might not be the reproach of the foolish, which he feared (Ps. 39:8); or he means that reproach which his enemies unjustly loaded him with. Let their lying lips be put to silence. 2. He pleads the goodness of God's judgments: "Lord, thou sittest in the throne, and thy judgments are right and good, just and kind, to those that are wronged, and therefore to thee I appeal from the unjust and unkind censures of men." It is a small thing to be judged of man's judgment, while he that judges us is the Lord. Or thus: "Thy word, and ways, and thy holy religion, are very good, but the reproaches cast on me will fall on them; therefore, Lord, turn them away; let not religion be wounded through my side." | 
