Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 20:1-8

“For that He might shew that they had always rebelled against the Holy Spirit, and that besides Isaiah, whom they remembered not, they had refused to believe John whom they had lately seen; He now in his turn puts the question to them, proving that if so great a Prophet as John who was accounted greatest among them had been disbelieved when he testified of Him, they would in no wise believe Him, answering by what authority He did this.”