Mark 11:29 KJV
And Jesus answered and said unto them, I will also ask of you one question, and answer me, and I will tell you by what authority I do these things.
Mark 11:29, King James Version
In context
28 And say unto him, By what authority doest thou these things? and who gave thee this authority to do these things?
29 And Jesus answered and said unto them, I will also ask of you one question, and answer me, and I will tell you by what authority I do these things.
30 The baptism of John, was it from heaven, or of men? answer me.