They were amazed at his teaching, because his words had authority.
OJBAnd they were amazed at his torah, because Rebbe Melech HaMoshiachʼs dvar torah was with samchut (authority).
TCENTThey were astonished at his teaching, because his message was spoken with authority.
T4TThey were continually amazed at what he was teaching, because he spoke ◄with authority/as people speak who have the right to command others what to do►.