How do we know that Jesus can cleanse us from sin?

The promise of Jesus cleansing us from sin is rooted in His sacrificial work and the efficacy of His blood. 1 John 1:7 states, 'the blood of Jesus Christ His Son cleanses us from all sin,' asserting that through His death and resurrection, all who believe can be washed clean. This cleansing is not merely external but transforms the heart, allowing believers to walk in the light of His truth. Zechariah 13:1 also foretells of a fountain opened for sin and uncleanness, pointing to Jesus as the fulfillment of this prophecy. Hence, the church takes comfort in the assurance of Christ's cleansing power, which draws sinners to seek His mercy.