9 and hast come in unto the priests, the Levites, and unto the judge who is in those days, and hast inquired, and they have declared to thee the word of judgment, 10 and thou hast done according to the tenor of the word which they declare to thee ('they' of that place which Jehovah doth choose; and thou hast observed to do according to all that they direct thee. 11 'According to the tenor of the law which they direct thee, and according to the judgment which they say to thee thou dost do; thou dost not turn aside from the word which they declare to thee, right or left. 12 And the man who acteth with presumption, so as not to hearken unto the priest (who is standing to serve there Jehovah thy God), or unto the judge, even that man hath died, and thou hast put away the evil thing 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.