John 9:26 - Ellicott's Commentary On The Whole Bible

Then said they to him again. — Failing to establish their denial of the fact, they repeat their questionings as to the means used. They hope, it may be, to detect some difference in the accounts, or something which they can construe into a charge against our Lord; or, perhaps, as some have suggested, their repeated questions are merely to gain time or cover their retreat. His honest boldness is too much for their craft. Their adjuration to speak as in God’s presence has been answered in a way they little expected, and the questions they now repeat are asked because they know not what to say.