Ephesians 1:7

In whom we have redemption through his blood
Redemption supposes captivity and slavery, and is a deliverance out of it; God's elect by nature are in bondage to sin, Satan, and the law; through the grace of Christ, they are redeemed from all iniquity; ransomed out of the hands of him that is stronger than they; and are freed from the law, its bondage, curse, and condemnation, and from every other enemy: and this benefit Christ is the author of; he was called to be the Redeemer of his people from all eternity; and he was sent in the fulness of time, to procure the redemption of them; to which he had a right, being their near kinsman; and for which he was every way fit, being God as well as man; and which he has obtained by his obedience, sufferings, and death: and in whom it resides, as in its proper subject and author; who, by imputation, is made redemption to all the chosen ones; for not angels, but men, share in this redemption; and not all men, but elect men; such as are chosen in Christ, predestinated to the adoption of children by him, and who are accepted in the beloved: and this comes to them through the blood of Christ, which was freely shed on the cross to procure it; and was a sufficient ransom, or redemption price; it being not only the same blood with those who are redeemed, but the blood of an innocent person; and not of a mere man, but of one who is truly and properly God, as well as man; see more of this (See Gill on Colossians 1:14). A branch of this redemption follows, or a blessing that comes by it, and along with it,

the forgiveness of sins;
of all sins, original and actual, past, present, and to come; and this is through the blood of Christ, which was shed for the same: and yet is

according to the riches of his grace;
for God of his rich grace found the ransom price, and gave his Son, as well as he gave himself, his life, a ransom for many; and how much soever it cost Christ to procure redemption and pardon, they are free to his people; who are redeemed without money and price of theirs, and whose sins are forgiven freely for Christ's sake.