Proverbs 16:6

6 By love and truth is iniquity expiated, And through the fear of Jahve one escapes from evil - literally, there comes (as the effect of it) the escaping of evil (סוּר, n. actionis, as Pro 13:19), or rather, since the evil here comes into view as to its consequences (Pro 14:27; Pro 15:24), this, that one escapes evil. By חסד ואמת are here meant, not the χάρις καὶ ἀλήθεια of God (Bertheau), but, like Pro 20:28, Isa 39:8, love and faithfulness in the relation of men to one another. The ב is both times that of the mediating cause. Or is it said neither by what means one may attain the expiation of his sins, nor how he may attain to the escaping from evil, but much rather wherein the true reverence for Jahve, and wherein the right expiation of sin, consist? Thus von Hofmann, Schriftbew. i. 595. But the ב of בחסד is not different from that of בּזאת, Isa 27:9. It is true that the article of justification is falsified if good works enter as causa meritoria into the act of justification, but we of the evangelical school teach that the fides qu justificat is indeed inoperative, but not the fides quae justificat, and we cannot expect of the O.T. that it should everywhere distinguish with Pauline precision what even James will not or cannot distinguish. As the law of sacrifice designates the victim united with the blood in the most definite manner, but sometimes also the whole transaction in the offering of sacrifice even to the priestly feast as serving לכפּר, Lev 10:17, so it also happens in the general region of ethics: the objective ground of reconciliation is the decree of God, to which the blood in the typical offering points, and man is a partaker of this reconciliation, when he accepts, in penitence and in faith, the offered mercy of God; but this acceptance would be a…

See here, 1. How the guilt of sin is taken away from us - by the mercy and truth of God, mercy in promising, truth in performing, the mercy and truth which kiss each other in Jesus Christ the Mediator - by the covenant of grace, in which mercy and truth shine so brightly - by our mercy and truth, as the condition of the pardon and a necessary qualification for it - by these, and not by the legal sacrifices, Mic 6:7, Mic 6:8. 2. How the power of sin is broken in us. By the principles of mercy and truth commanding in us the corrupt inclinations are purged out (so we may take the former part); however, by the fear of the Lord, and the influence of that fear, men depart from evil; those will not dare to sin against God who keep up in their minds a holy dread and reverence of him.

16:6 God’s unfailing love and faithfulness are foundational in his covenant relationship with Israel (see Exod 15:13; 34:6-7; Num 14:18-19; Deut 7:9-11).