Deuteronomy 17:11-13

11Act according to whatever they teach you and the decisions they give you. Do not turn aside from what they tell you, to the right or to the left.

12Anyone who shows contempt for the judge or for the priest who stands ministering there to the Lord your God is to be put to death. You must purge the evil from Israel.

13All the people will hear and be afraid, and will not be contemptuous again.