And they that were sent, &c. John adds this, to suggest the occasion why they examined John the Baptist concerning baptism. These messengers who were sent to John were Pharisees, and therefore were well versed in the Scriptures. Consequently they knew that Messiah would baptize for the remission of sins, because Ezekiel ( Ezekiel 36:25) and Zechariah ( Zechariah 13:1) had predicted that He would do so. But concerning other prophets and saints they had not read in Scripture that they would baptize. They ask John therefore to tell them by what authority he baptized, especially since he not only asserted that he was not Christ, but not even a prophet.
