Hebrews 8:12

“For I will be merciful to their unrighteousness, etc..] That is, sin; for all unrighteousness is sin, being contrary to the justice of God, and his righteous law: and the phrase is expressive of God's forgiveness of it, which is a very considerable article of the covenant of grace; mercy is the spring and original of pardon; it is what God delights in, and therefore he pardons freely; it is large and abundant, and hence he pardons fully; and this lays a foundation for hope in sensible sinners: and the way and means, in and by which God pardons, is the propitiatory sacrifice of his Son; and the word here rendered “merciful”, signifies “propitious”; God pardons none but those to whom he is…”

“For, &c.--the third of "the better promises" (Heb 8:6). The forgiveness of sins is, and will be, the root of this new state of inward grace and knowledge of the Lord. Sin being abolished, sinners obtain grace. I will be merciful--Greek, "propitious"; the Hebrew, "salach," is always used of God only in relation to men. and their iniquities--not found in Vulgate, Syriac, Coptic, and one oldest Greek manuscript; but most oldest manuscripts have the words (compare Heb 10:17). remember no more--Contrast the law, Heb 10:3.”

“For I will be merciful to their unrighteousness ... - That is, the blessing of “pardon” will be much more richly enjoyed under the new dispensation than it was under the old. This is the “fourth” circumstance adduced in which the new covenant will surpass the old. That was comparatively severe in its inflictions (see Hebrews 10:28); marked every offence with strictness, and employed the language of mercy much less frequently than that of justice. It was a system where law and justice reigned; not where mercy was the crowning and prevalent attribute. It was true that it contemplated pardon, and made arrangements for it; but it is still true that this is much more prominent in the new…”

“For I will justify them, which is the root of all true knowledge of God. This, therefore, is God's method. First, a sinner is pardoned: then he knows God, as gracious and merciful then God's laws are written on his heart: he is God's, and God is his. Hebrews 8:13”

“8:12 A final characteristic of the new covenant is that God would forgive their wickedness and never again remember their sins. The blood of Jesus cleanses his people completely from sin (9:13-15; 10:14-18, 22; 1 Jn 1:7).”

“Heb 10:16, Heb 10:17; Psa 25:7, Psa 65:3; Isa 43:25, Isa 44:22; Jer 33:8, Jer 50:20; Mic 7:19; Act 13:38, Act 13:39; Rom 11:27; Eph 1:7; Col 1:14; Jo1 1:7-9, Jo1 2:1, Jo1 2:2; Rev 1:5 Hebrews 8:13”