Mark 2:5

And Jesus seeing their faith saith unto the sick of the palsy, Son, thy sins are forgiven.

Their faith ... refers to the faith of all five, there being no logical way to suppose that the four believers brought an unbeliever.

Son, thy sins are forgiven ... This was not a part of the healing but an entirely different and far more wonderful blessing than the healing of the man's body. That forgiveness was here pronounced by Jesus Christ in the absence of the man's confessing any faith and without regard to his submission to any kind of ordinance of God was not a relaxation of the requirements binding upon all men today. Prior to the will of Jesus Christ being formalized and proclaimed to all the world, there were numerous instances, of which this is one, in which the Lord proclaimed forgiveness to men.

The declaration of Jesus had profound implications: (1) it was an assertion of his deity, the convictions of all ages sustaining the view that "only God" can forgive sins. (2) It was an indication that he had read the hearts of the five men before him, especially of the sufferer, and that he had determined the spiritual attitude of the man to have been fully consistent with the reward bestowed. (3) It proved that Jesus understood the man's greater need as forgiveness, and so that was given first.