For this is my covenant unto them, when I shall take away their sins.
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Ambrosiaster
AD 400
The covenant will always be there, however long it takes for them to believe. For this is the Lord Jesus, who has promised to come from heaven in order to set the human race free. Every day he forgives the sins of those who turn to God, nor does he condemn unbelievers straightaway but waits for them, knowing that they may come to a knowledge of God. Commentary on Paul’s Epistles.
God’s covenant will be fulfilled not when they are circumcised, nor when they do the other deeds of the law, but when they obtain forgiveness of sins. If this has been promised but has not yet happened in their case, nor have they enjoyed the forgiveness of sins in baptism, nevertheless it will certainly come to pass.