Heart of Jesus, Atonement for our sins, have mercy on us.

Atonement is an Old Testament term that is replaced by the writers of the New Testament with “redemption”.   The most important act of God’s atonement/redemption of His people in the Old Testament was the Exodus from Egypt.   “Then they shall take some of the blood, and put it on the two doorposts and the lintel of the houses in which they eat them…The blood shall be a sign for you, upon the houses where you are; and when I see the blood, I will pass over you, and no plague shall fall upon you to destroy you, when I smite the land of Egypt.” (Exodus 12: 7, 13)

The important yearly event for the Jewish people was the  “Day of Atonement” (see Leviticus 16:1-34 for details).  These are some of the “futile ways” of the Old Testament that St. Peter is referring to in the following verse:

“You know that you were ransomed from the futile ways inherited from your fathers, not with perishable things such as silver or gold, but with the precious blood of Christ, like that of a lamb without blemish or spot.” (1 Peter 1:18-19).

It is the blood of the Sacred Heart of Jesus that is the eternal atonement of all humanity.