Then they were all amazed, so that they questioned among themselves, saying, “What is this? What new doctrine is this? For with authority He commands even the unclean spirits, and they obey Him.” And immediately His fame spread throughout all the region around Galilee. Mark 1:26-28
The unclean spirits had to obey, but Jesus began His ministry to a group that could be unbelieving, unfaithful, ignorant, foolish, opposing, and even murderous to new prophets. The stones were seldom far from the hands of the Jewish people of Galilee and Judea. The unclean spirits knew who He was, but Jesus didn't want their testimony. Instead for about three years, Jesus would face humanity at its worst, and in time He would lay down His life for them. For all that the Jews of this time will do, at this moment in scripture the Lord Jesus comes to them as a big question: What is this?
Asking is a good start, but believing in Him is a better finish,
Bucky