John 9:25

Whether he is a sinner, I know not: but one thing I know, that, whereas I was blind, now I see.

This return of the healed man to the facts of the wonder was the last thing the Pharisees wanted; and his words are construed as an opposition to their designs. The miracle was proof that Jesus was no sinner; and the Sanhedrin knew this, as one of their own members had admitted (John 3:2).