John Chrysostom
Having said that sacrifices are no longer offered, he confirmed this both from Scripture and apart from Scripture. He also presented the prophetic saying: "Sacrifice and offering, burnt offerings and sacrifice for sin, which are offered according to the law, Thou didst not desire, nor hadst pleasure in them." Now he says that God has already forgiven sins.
He again assures us of this by the testimony of Scripture: "The Holy Spirit also bears witness to us," he says, "for after He had said: This is the covenant that I will make with them after those days, says the Lord. I will put My laws into their hearts, and write them on their minds, and their sins and their lawless deeds I will remember no more. Now where there is forgiveness of sins, there is no longer any offering for them."
Thus God forgave sins when He gave the new covenant. He gave this covenant because of the sacrifice of Christ. If He forgave sins through this one sacrifice, then there is no longer need for another.