This man is not of God — Not sent of God. How can a man that is a sinner — That is, one living in wilful sin, do such miracles?
Related Commentaries of John 9:16
John 9:16
16 Therefore said some of the Pharisees, This man is not of God, because he keepeth not the sabbath day. Others said, How can a man that is a sinner do such miracles? And there was a division among them.