Your testimonies that you have commanded are righteous and very faithful.
Read Chapter 119
Augustine of Hippo
136. Thus, then, as if giving a reason why he had cause to weep much, and to mourn deeply for his sin, he saith, "Righteous art Thou, O Lord, and true is Thy judgment" (ver. 137). "Thou hast commanded Thy testimonies, righteousness, and Thy truth exceedingly" (ver. 138). This righteousness of God and righteous judgment and truth, is to be feared by every sinner: for thereby all who are condemned are condemned of God; nor is there one who can righteously complain against the righteous God of his own damnation. Therefore the tears of the penitent are needful; since if his impenitent heart were condemned, he would be most justly condemned. He indeed calleth the testimonies of God righteousness: for He proveth himself righteous by giving righteous commandments.And this is truth also, that God may become known by such testimonies.
Truth. Thy laws are just and true in all respects, though we may not be able to discern it always, Romans ix. 20., and xi. 33. (Berthier)
God punishes the wicked in his justice, and rewards the just in his truth, or according to his promises. (Theodoret)