In Romans 3:25 , Paul expounds further on the great news of salvation. He uses a fancy word, propitiation. The Greek word for it, hilasterion, occurs in the New Testament only here and in Hebrews 9:5 , where it is translated as “mercy-seat.” As used in Romans 3:25 to describe the offer of justification and redemption through Christ, propitiation seems to represent the fulfillment of all that was typified by the mercy-seat in the Old Testament sanctuary.
Read more at the source: Wednesday: The Righteousness of Christ