11 You must carry out fully the law that they interpret for you or the ruling that they announce to you; do not turn aside from the decision that they announce to you, either to the right or to the left.

Matthew Henry's Commentary on Deuteronomy 17:11

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.