How do we know that the blood of Jesus has power to cleanse sin?

The power of Jesus' blood is foundational to sovereign grace theology, as it is the blood of the Lamb that cleanses and redeems. Revelation 5:9 states that Christ has redeemed us to God by His blood, signifying that His sacrificial death satisfies the requirements of divine justice for sin. Furthermore, the New Testament teaches that when God sees the blood of Christ, He passes over our sins, just as in the Passover in Exodus 12. This exemplifies the enormous power and eternal worth of His sacrifice, making it possible for believers to stand justified before God.