How do we know that Jesus has the power to cleanse us from sin?

We know Jesus has the power to cleanse us from sin because evidenced by His miracles, particularly His authority over physical ailments. In Luke 5, Jesus cleanses a leper, demonstrating His ability to restore what is deemed unclean. This act serves not only as a physical healing but also illustrates the greater spiritual reality where Christ's sacrifice and His shed blood provide the cleansing necessary for salvation. His willingness to cleanse the leper signifies His willingness to save all who turn to Him in faith.