John Gill Commentary John 9:17

"They say therefore unto the blind man again, What sayest thou of him, in that he opened thine eyes? And he said, He is a prophet." — John 9:17 (ASV)

They say unto the blind man again
After they had discoursed among themselves, and could not agree about the author of the miracle, they turn to him that had been blind, who is called the blind man, because he had been so, and ask him his sentiments of him:

what sayest thou of him, that he has opened your eyes ?
the question seems, at first sight, as if it was, whether Jesus had opened his eyes or not; but by the answer it appears, that it required his thoughts of him, "who has opened your eyes", as the Vulgate Latin and Persic versions read; or "seeing", or "because he has opened your eyes", as the Arabic and Ethiopic versions:

he said, he is a prophet ;
the Syriac and Persic versions read, "I say he is a prophet"; or, "he is certainly a prophet", as the Arabic version. The Jews were wont to conclude a man's being a prophet from miracles wrought by him; see (John 6:14) (7:31) ; though it does not appear that he believed him, as yet, to be that prophet, or the Messiah, that was to come; see (John 9:36) .