There was no prophet in Israel for about five centuries after the Prophet Malachi, who lived around 450 B.C. until John the Baptist. During this intertestamental period with no prophet, the Jews developed groups of scholars who interpreted the Holy Scripture according to their own views. That was why Jesus had to reinstate the laws to their original intentions. However, that resulted in disagreements between Jesus and the Jewish groups.
Jesus spoke of the Pharisees: “Let them alone; they are blind guides [of the blind]. If a blind person leads a blind person, both will fall into a pit” (Mt 15:14). We have to assure we are following those whom Jesus appointed as his representatives for authoritative teaching. Otherwise, we also will end up in spiritual darkness.