Deuteronomy 17:11-13

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.

13Then everyone else will hear about it and be afraid to act so arrogantly.