For, etc. - 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).