I John 2:2

“Propitiation” is translated from the Greek ιγασµος, which denotes a propitiation or expiation of sin by an atoning sacrifice. “Propitiation” is the best translation because it means a continuous atonement. God the Father is continually propitiating the true believer’s sins according to His grace and mercy through the sacrifice of Jesus Christ, as John shows in the previous chapter.