Matthew 21:27 - Ellicott's Commentary On The Whole Bible

We cannot tell. — The confession of impotence to which the priests and scribes were thus brought was, as has been said, a virtual abdication. Before such a tribunal the Prophet whom they called in question might well refuse to plead. There was, indeed, no need to answer. For those who were not wilfully blind and deaf, the words that He had spoken, the works which He had done, the sinless life which He had led, were proofs of an authority from God.