Deuteronomy 17:11-12

11According to the instructions that they give you, and according to the decision which they pronounce to you, you shall do. You shall not turn aside from the verdict that they declare to you, either to the right hand or to the left.

12The man who acts presumptuously by not obeying the priest who stands to minister there before the Lord your God, or the judge, that man shall die. So you shall purge the evil from Israel.