Deuteronomy 17:9-12

9and present them to the Levitical priests or the judge on duty at that time. They will hear the case and declare the verdict.

10You must carry out the verdict they announce and the sentence they prescribe at the place the Lord chooses. You must do exactly what they say.

11After they have interpreted the law and declared their verdict, the sentence they impose must be fully executed; do not modify it in any way.

12Anyone arrogant enough to reject the verdict of the judge or of the priest who represents the Lord your God must die. In this way you will purge the evil from Israel.