Mark 11:28-33
28 “By what authority are you doing these things?” they asked. “And who gave you authority to do this?”
29 Jesus replied, “I will ask you one question. Answer me, and I will tell you by what authority I am doing these things.
30 John’s baptism—was it from heaven, or from men? Tell me!”
31 They discussed it among themselves and said, “If we say, ‘From heaven,’ he will ask, ‘Then why didn’t you believe him?’
32 But if we say, ‘From men’…” (They feared the people, for everyone held that John really was a prophet.)
33
So they answered Jesus, “We don’t know.”
Jesus said, “Neither will I tell you by what authority I am doing these things.”