9 And 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; 10 and 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: 11 according 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. 12 And the man that shall act presumptuously, and not hearken unto the priest that standeth to serve there before Jehovah thy God, or unto the judge, that man shall die; and thou shalt put away evil from Israel.
Matthew Henry's Commentary on Deuteronomy 17:9-12
Commentary on Deuteronomy 17:8-13
(Read Deuteronomy 17:8-13)
Courts of judgment were to be set up in every city. Though their judgment had not the Divine authority of an oracle, it was the judgment of wise, prudent, experienced men, and had the advantage of a Divine promise.