The Jewish leaders didn't believe the man had been blind and received his sight until they called for his parents.
The Jewish leaders asked them, "Is this your son? Are you saying he was born blind? How can he now see?"
His parents answered, "We know he is our son. We know he was born blind.
But we don't know how he now sees, and we don't know who healed his eyes. Ask him. He's old enough to speak for himself."
His parents said this because they feared the Jewish authorities. This is because the Jewish authorities had already decided that whoever confessed Jesus to be the Christ would be expelled from the synagogue.
That's why his parents said, "He's old enough. Ask him."
Therefore, they called a second time for the man who had been born blind and said to him, "Give glory to God. We know this man is a sinner."
The man answered, "I don't know whether he's a sinner. Here's what I do know: I was blind and now I see."
They questioned him: "What did he do to you? How did he heal your eyes?"
He replied, "I already told you, and you didn't listen. Why do you want to hear it again? Do you want to become his disciples too?"
They insulted him: "You are his disciple, but we are Moses' disciples.
We know that God spoke to Moses, but we don't know where this man is from."
The man answered, "This is incredible! You don't know where he is from, yet he healed my eyes!
We know that God doesn't listen to sinners. God listens to anyone who is devout and does God's will.
No one has ever heard of a healing of the eyes of someone born blind.
If this man wasn't from God, he couldn't do this."
They responded, "You were born completely in sin! How is it that you dare to teach us?" Then they expelled him.