Luk 20:1 And it came to pass, that on one of those days, as he taught the people in the temple, and preached the gospel, the chief priests and the scribes came upon him with the elders,
Luk 20:2 And spake unto him, saying, Tell us, by what authority doest thou these things? or who is he that gave thee this authority?
Luk 20:8 And Jesus said unto them, Neither tell I you by what authority I do these things.
Jesus will shortly reveal this to his disciples:
Matthew 28:18 And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.
It’s useful to note that the same Greek word is used in both verses.
G1849 ἐξουσία exousia