Deuteronomy 17:11-12

11according to the sentence of the law which they shall declare unto thee, and according to the judgment which they shall tell thee, thou shalt do: thou shalt not decline from the word which they shall declare unto thee, to the right hand, or the left.

12And the man that shall act presumptuously, and not hearken unto the priest that standeth to serve there before Jehovah thy 1God, or unto the judge, that man shall die; and thou shalt put away evil from Israel.