How do we know that Jesus can forgive sins?

The authority of Jesus to forgive sins is established by His divine nature and power as the God-man. In Mark 2:5, when Jesus says to the sick of the palsy, 'Son, thy sins be forgiven thee,' He confirms that only God has the power to forgive sins. The reaction of the scribes shows their disbelief, yet Jesus's ability to heal physically also affirms His authority to forgive sin, as He declares in Mark 2:10 that the Son of Man has power on earth to forgive sins. This dual demonstration of spiritual and physical healing solidifies His divine authority and the reality that He is God incarnate.