“Then said they unto him, Where is he? He said, I know not.”
John 9:12 — Greek Interlinear
Church Fathers on John 9:12
The neighbors therefore, and they which had seen him that he was blind, said, Is not this he that sat and begged? Wonderful clemency and condescension of God! Even the beggars He heals with so great considerateness: thus stopping the mouths of the Jews; in that He made not the great, illustrious, and noble, but the poorest and meanest, the objects of His providence. Indeed He had come for the salvation of all. Some said, This is he. The blind man having been clearly…
His eyes being opened had altered his look. But he said, I am he. He spoke gratefully; a denial would have convicted Him of ingratitude.
Thus he represents the state of the catechumen, who believes in Jesus, but does not, strictly speaking, know Him, not being yet washed. It fell to the Pharisees to confirm or deny the miracle.