John Gill Commentary Psalms 130:8

"And he will redeem Israel From all his iniquities." — Psalms 130:8 (ASV)

And he shall redeem Israel from all his iniquities .
The Lord shall do it; in whom Israel is encouraged to hope; with whom grace and redemption were; or who was appointed to be the Redeemer. Redemption was then future, when these words were said, but certain, by the promise of God and agreement of Christ; and would be of the whole Israel, or elect of God; and that from "all" their iniquities, original and actual; sins, secret and open, of heart, lip, and life:

and which is no small encouragement for Israel to hope in the Lord, for the sake of which this is added; as well as for the further illustration of the nature of redemption by Christ; which is complete, and now obtained, and is an eternal one.