And they answered Jesus and said, we cannot tell,.... They saw the dilemma they were brought into; they chose rather therefore to speak against their own consciences, and tell a wilful lie, and incur the reproach of ignorance: who, at other times, took upon them to judge of a prophet, whether he was a true or a false one, and by what authority he acted, whether of God, or man: but now being reduced to this wretched condition, contrary to their office and character, declare they did not know, and could not tell from whence John had his commission, and who gave him his authority:

and he said unto them, neither tell I you by what authority I do these things: since, according to the proposal of Christ, and the agreement he entered into with them, they did not give him a direct answer to his question, he looked upon himself under no obligation to inform them, what was his authority, and from whence he had it; though by the question he put to them he tacitly suggests, that he had his authority not from man, but from God; and by this his answer signifies, that since John preached and baptized without their authority and approbation, so might he; nor was he dependent on them, or accountable to them.

And they answered Jesus, and said, We cannot tell--Evidently their difficulty was, how to answer, so as neither to shake their determination to reject the claims of Christ nor damage their reputation with the people. For the truth itself they cared nothing whatever.

Neither tell I you by what authority I do these things--What composure and dignity of wisdom does our Lord here display, as He turns their question upon themselves, and, while revealing His knowledge of their hypocrisy, closes their mouths! Taking advantage of the surprise, silence, and awe produced by this reply, our Lord followed it up immediately by the two following parables.

Parable of the Two Sons (Mat 21:28-32).