By this time they had arrived in Jerusalem again. As Jesus was walking through the Temple area, the leading priests, the teachers of religious law, and the other leaders came up to him. They demanded,
"By whose authority did you drive out the merchants from the Temple? Who gave you such authority?"
References for Mark 11:28
"I'll tell who gave me authority to do these things if you answer one question," Jesus replied.
"Did John's baptism come from heaven or was it merely human? Answer me!"
They talked it over among themselves. "If we say it was from heaven, he will ask why we didn't believe him.
But do we dare say it was merely human?" For they were afraid that the people would start a riot, since everyone thought that John was a prophet.
So they finally replied, "We don't know." And Jesus responded, "Then I won't answer your question either."