Moses
Deuteronomy 17:9ESV·traditional attribution

And you shall come to the Levitical priests and to the judge who is in office in those days, and you shall consult them, and they shall declare to you the decision.

Matthew Henry Presbyterian @wholebiblehenry

Courts of judgment were ordered to be erected in every city (Deu 16:18), and they were empowered to hear and determine causes according to law, both those which we call pleas of the crown and those between party and party; and we may suppose that ordinarily they ended the matters that were brought before them, and their sentence was definitive; but, 1.

Commenting on Deuteronomy 17:8-13

John Gill Reformed Baptist @doctorgill

Thou shalt come unto the priests, the Levites,.... The priests that are of the tribe of Levi, as the Targum of Jonathan, and so Jarchi; for Aben Ezra says there are priests that are not of the genealogy of Levi; such there were indeed in Jeroboam's time, Kg1 12:31.

Jamieson-Fausset-Brown Reformed @jfbcommentary

THE PRIESTS AND JUDGES TO DETERMINE CONTROVERSIES. (Deu 17:8-13) If there arise a matter too hard for thee in judgment--In all civil or criminal cases, where there was any doubt or difficulty in giving a decision, the local magistrates were to submit them by reference to the tribunal of the Sanhedrim--the supreme council, which was composed partly of civil and partly of ecclesiastical persons.

Commenting on Deuteronomy 17:8-13