Matthew 21:25 - Ellicott's Commentary On The Whole Bible

They reasoned with themselves. — The self-communing was eminently characteristic. The priests and scribes had, in dealing with the mission of John, halted between two opinions. At one time they came to his baptism (Matthew 3:7); at another they said, “He hath a devil” (Matthew 11:18). They watched the ebb and flow of a public reverence which the death of John had deepened, and dared not repudiate his character as a prophet. They were reluctant to admit that character, for this would have involved the necessity of accepting the testimony which he had borne to the work and office of Jesus.