Mark 11:27-30

Then they came again to Jerusalem. And as He was walking in the temple, the chief priests, the scribes, and the elders came to Him. And they said to Him, “By what authority are You doing these things? And who gave You this authority to do these things?” But Jesus answered and said to them, “I also will ask you one question; then answer Me, and I will tell you by what authority I do these things: The baptism of John—was it from heaven or from men? Answer Me.”