Mt 21,23-27
He had gone into the Temple and was teaching, when the chief priests and the elders of the people came to him and said, ‘What authority have you for acting like this? And who gave you this authority?’ In reply Jesus said to them, ‘And I will ask you a question, just one; if you tell me the answer to it, then I will tell you my authority for acting like this. John’s baptism: what was its origin, heavenly or human?’