Deuteronomy 17:8, 18

“If any case arises requiring decision between one kind of homicide and another, one kind of legal right and another, or one kind of assault and another, any case within your towns that is too difficult for you, then you shall arise and go up to the place that the LORD your God will choose.

“And when he sits on the throne of his kingdom, he shall write for himself in a book a copy of this law, approved by the Levitical priests.