Mark 11:31-35

And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then did ye not believe him?

But if we shall say, Of men; they feared the people: for all men counted John, that he was a prophet indeed.

And they answered and said unto Jesus, We cannot tell. And Jesus answering saith unto them, Neither do I tell you by what authority I do these things.