Deuteronomy 17:9

17:9 You will go to the Levitical priests and the judge in office in those days and seek a solution; they will render a verdict.

Deuteronomy 17:11-12

17:11 You must do what you are instructed, and the verdict they pronounce to you, without fail. Do not deviate right or left from what they tell you. 17:12 The person who pays no attention to the priest currently serving the Lord your God there, or to the verdict – that person must die, so that you may purge evil from Israel.

Deuteronomy 21:5

21:5 Then the Levitical priests will approach (for the Lord your God has chosen them to serve him and to pronounce blessings in his name, and to decide every judicial verdict)