Mark 11:29-33

29And Jesus said unto them, I will ask of you one question, and answer me, and I will tell you by what authority I do these things. 30The baptism of John, was it from heaven, or from men? answer me. 31And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then did ye not believe him? 32But should we say, From men—they feared the people: for all verily held John to be a prophet. 33And they answered Jesus and say, We know not. And Jesus saith unto them, Neither tell I you by what authority I do these things.