Charles Spurgeon Commentary John 9:18-24

"The Jews therefore did not believe concerning him, that he had been blind, and had received his sight, until they called the parents of him that had received his sight, and asked them, saying, Is this your son, who ye say was born blind? How then doth he now see? His parents answered and said, We know that this is our son, and that he was born blind: but how he now seeth, we know not; or who opened his eyes, we know not: ask him; he is of age; he shall speak for himself. These things said his parents, because they feared the Jews: for the Jews had agreed already, that if any man should confess him [to be] Christ, he should be put out of the synagogue. Therefore said his parents, He is of age; ask him. So they called a second time the man that was blind, and said unto him, Give glory to God: we know that this man is a sinner." — John 9:18-24 (ASV)

But the Jews did not believe concerning him, that he had been blind and received his sight, until they called the parents of him that had received his sight. And they asked them, saying, Is this your son, who you say was born blind? How then does he now see?

His parents answered them and said, We know that this is our son, and that he was born blind: But by what means he now sees, we know not; he is of age; ask him: he shall speak for himself. These words spoke his parents, because they feared the Jews: for the Jews had agreed already, that if any man did confess that he was Christ, he should be put out of the synagogue. Therefore said his parents, He is of age; ask him. Then again they called the man that was blind, and said to him, Give God the praise: we know that this man is a sinner.

How piously these Pharisees can talk; and generally in the name of God all sorts of mischief begin. When men are persecuting the Son of God, yet still they take the name of God upon their lips. Did they not burn the martyrs to the glory of God? Oh! yes, and so did these men thus slander Christ by saying, "We know that this man is a sinner," and yet they spoke about giving God praise.