A.T. Robertson Commentary Mark 2:5

"And Jesus seeing their faith saith unto the sick of the palsy, Son, thy sins are forgiven." — Mark 2:5 (ASV)

Their faith (την πιστιν αυτων). The faith of the four men and of the man himself. There is no reason for excluding his faith. They all had confidence in the power and willingness of Jesus to heal this desperate case.

Are forgiven (αφιεντα, aoristic present passive, cf. punctiliar action, Robertson's

Grammar, pp. 864ff.). So Mt 9:3, but Lu 5:20 has the Doric perfect passive αφεωντα. The astonishing thing both to the paralytic and to the four friends is that Jesus forgave his sins instead of healing him. The sins had probably caused the paralysis.