Deuteronomy 21:5
And the priests the sons of Levi shall come near; for them the Lord thy God hath chosen to minister unto him, and to bless in the name of the Lord; and by their word shall every controversy and every stroke be tried: (Deuteronomy 21:5)
R04 Deuteronomy 10:8  R05 Deuteronomy 17:8,9, Deuteronomy 19:17
Deuteronomy 10:8 At that time the Lord separated the tribe of Levi, to bear the ark of the covenant of the Lord, to stand before the Lord to minister unto him, and to bless in his name, unto this day. 10 I MC VC
Deuteronomy 17:8~9
Deuteronomy 17:8 If there arise a matter too hard for thee in judgment, between blood and blood, between plea and plea, and between stroke and stroke, being matters of controversy within thy gates: then shalt thou arise, and get thee up into the place which the Lord thy God shall choose; 10 I MC VC
Deuteronomy 17:9 And thou shalt come unto the priests the Levites, and unto the judge that shall be in those days, and enquire; and they shall shew thee the sentence of judgment: 10 I MC VC
Deuteronomy 19:17
Deuteronomy 19:17 Then both the men, between whom the controversy is, shall stand before the Lord, before the priests and the judges, which shall be in those days; 10 I MC VC