Deuteronomy 17:9-11

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

10and thou shalt do according to the tenor of the sentence, which they shall shew thee from that place which the LORD shall choose; and thou shalt observe to do according to all that they shall teach thee:

11according to the tenor of the law which they shall teach thee, and according to the judgment which they shall tell thee, thou shalt do: thou shalt not turn aside from the sentence which they shall shew thee, to the right hand, nor to the left.