1 Chronicles 26:29

Chenaniah, &c., were for the outward business That is, the business without the city of Jerusalem; which neither belonged to the singers nor the porters, whose business was within the city. For officers and judges To be assessors with the ordinary judges in the several cities and towns, to determine questions and controversies which might arise among them. And the reason why the Levites were intrusted with these matters was, because the common law of Israel, by which they had and held all their rights, was no other than the law of God, whereof the priests and Levites, being the established interpreters, must needs be the most proper judges of things depending thereon.