John Gill Commentary Psalms 119:138

"Thou hast commanded thy testimonies in righteousness And very faithfulness." — Psalms 119:138 (ASV)

Your testimonies that you have commanded [are] righteous ,
&c.] The Scriptures are holy, just, and good; and what is contained in them are according to godliness; are for instruction in righteousness, and teach men to live soberly, righteously, and godly;

and very faithful ;
or "true" ^F21 : all the sayings in them are true and faithful sayings; for they are the sayings of God that cannot lie; the promises in them are faithfully performed by him that made them; they are all yea and amen in Christ. The words may be rendered, "you have commanded righteousness [in] your testimonies, and truth" or faith "exceedingly": so the Arabic version. God in the law requires of men a perfect righteousness, every way agreeable to its demands; and in his Gospel he reveals the complete righteousness of his Son, which he has commanded to be published in it, to be laid hold on and received by faith as a justifying righteousness, as it is to all that believe: this, with every other truth of the Gospel, is made manifest by the Scriptures according to the commandment of the everlasting God, (Romans 16:25Romans 16:26) .

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FOOTNOTES:

• F21: (dam hnwmaw) "et verissimae", Vatablus, "veritas valde, i.e. prorsus verissima", Gejerus.