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

Throughout the Gospels, Jesus performs numerous miracles, including the healing of lepers, to showcase His divine authority and ability to restore. The leper's plea to Jesus, 'If thou wilt, thou canst make me clean,' reflects a deep faith in Christ's limitless ability to heal, which is not constrained by human understanding or condition. In addition to physical healings, Jesus ultimately fulfills the requirements of the law through His death on the cross, where His shed blood provides cleansing from sin. His resurrection further affirms His victory over sin and death, confirming that He is indeed capable of making us clean before God.