What does it mean that Jesus purified our sins by Himself?

When it is stated that Jesus purified our sins by Himself, it indicates that His atonement was complete and requires no addition from human actions. In Hebrews, it emphasizes that no one will be in hell for whom Christ died, supporting the doctrine of limited atonement as understood in Reformed theology. This underscores the sufficiency of His sacrifice—Christ's blood is sufficient for the complete cleansing of sin. The focus is on His work, not ours, and underscores the grace of God in salvation. Thus, believers can rest assured that their salvation does not depend on their performance but is grounded in the finished work of Christ.