The Divine Son - Propitiation
We are justified, or made right with God based upon Christ's propitiation. Propitiation is an Old Testament word referring to the Mercy Seat of the tabernacle. It was at the Mercy Seat where the high priest once a year poured out the blood of sacrifices on the altar, so that God would be satisfied concerning the issue of the sin of the people of Israel. Those Old Testament sacrifices were of animals and had no lasting value. But because Christ is the one who poured out his blood, Scripture tells us that we are justified freely as a gift because of the value of who he is to God the Father.
...being justified as a gift by His grace through the redemption which is in Christ Jesus; whom God displayed publicly as a propitiation in His blood through faith. This was to demonstrate His righteousness, because in the forbearance of God He passed over the sins previously committed (Rom 3:24-25).
This propitiation also is a demonstration that God has completely dealt with human sin. Propitiation means God is satisfied, and so we must be too.