Mark 11:31-33

And they reasoned among themselves, saying, “If we say, ‘From heaven,’ He will say, ‘Why then did you not believe him?’ But if we say, ‘From men’ ”—they feared the people, for all counted John to have been a prophet indeed. So they answered and said to Jesus, “We do not know.” And Jesus answered and said to them, “Neither will I tell you by what authority I do these things.”