5 But there are who say, Behold, the Lord has risen again; but must I hope on that account that I also may rise again? Certainly, on that account: for the Lord rose again in that which He assumed from you. For He would not rise again, save He had died; and He could not have died, except He bore the flesh. What did the Lord assume from you? The flesh. What was He that came Himself? The Word of God, who was before all things, through whom all things were made. But that He might receive something from you, “The Word became flesh, and dwelt among us.” He received from you, what He might offer for you; as the priest receives from you, what he may offer for you, when you wish to appease God for your sins.
It has already been done, it has been done thus. Our Priest received from us what He might offer for us: for He received flesh from us, in the flesh itself He was made a victim, He was made a holocaust, He was made a sacrifice. In the Passion He was made a sacrifice; in the Resurrection He renewed that which was slain, and offered it as His first-fruits unto God, and says unto you, All that is yours is now consecrated: since such first-fruits have been offered unto God from you; hope therefore that that will take place in yourself which went before in your first-fruits.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)