27 Then when they were back in Jerusalem once again, as they were walking through the Temple, the high priests, religion scholars, and leaders came up 28 and demanded, "Show us your credentials. Who authorized you to speak and act like this?" 29 Jesus responded, "First let me ask you a question. Answer my question and then I'll present my credentials. 30 About the baptism of John - who authorized it: heaven or humans? Tell me." 31 They were on the spot, and knew it. They pulled back into a huddle and whispered, "If we say 'heaven,' he'll ask us why we didn't believe John; 32 if we say 'humans,' we'll be up against it with the people because they all hold John up as a prophet." 33 They decided to concede that round to Jesus. "We don't know," they said. Jesus replied, "Then I won't answer your question either."
Matthew Henry's Commentary on Mark 11:27-33
Commentary on Mark 11:27-33
(Read Mark 11:27-33)
Our Saviour shows how near akin his doctrine and baptism were to those of John; they had the same design and tendency, to bring in the gospel kingdom. These elders did not deserve to be taught; for it was plain that they contended not for truth, but victory: nor did he need to tell them; for the works he did, told them plainly he had authority from God; since no man could do the miracles which he did, unless God were with him.