Matthew Henry (Commentary, Isaiah 1):
The reformation of a people will be the redemption of them and their converts, for sin is the worst captivity, the worst slavery, and the great and eternal redemption is that by which Israel is redeemed from all his iniquities (Ps. 130:8), and the blessed Redeemer is he that turns away ungodliness from Jacob (Rom. 11:26), and saves his people from their sins, Mt. 1:21. All the redeemed of the Lord shall be converts, and their conversion is their redemption: “Her converts, or those that return of her (so the margin), shall be redeemed with righteousness.” God works deliverance for us by preparing us for it with judgment and righteousness.
