Mark 11:28-29; Mark 11:33

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.
33 So they answered Jesus, "We don't know." Jesus said, "Neither will I tell you by what authority I am doing these things."