Deuteronomy 17:9-11

9And thou shalt come unto the priests, the Levites, and unto the judge that shall be in those days, and inquire; and they shall declare unto thee the sentence of judgment;

10and thou shalt do according to the tenor of the word, which they of that place which Jehovah will choose shall declare unto thee; and thou shalt take heed to do according to all that they instruct thee:

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.