9 and you shall come to the priests the Levites, and to the judge who shall be in those days: and you shall inquire; and they shall show you the sentence of judgment. 10 You shall do according to the tenor of the sentence which they shall show you from that place which Yahweh shall choose; and you shall observe to do according to all that they shall teach you: 11 according to the tenor of the law which they shall teach you, and according to the judgment which they shall tell you, you shall do; you shall not turn aside from the sentence which they shall show you, to the right hand, nor to the left. 12 The man who does presumptuously, in not listening to the priest who stands to minister there before Yahweh your God, or to the judge, even that man shall die: and you shall put away the 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.