Jamieson, Fausset and Brown on 2 Chronicles 19:5-7

5-7. he set judges in the land--There had been judicial courts established at an early period. But Jehoshaphat was the first king who modified these institutions according to the circumstances of the now fragmentary kingdom of Judah. He fixed local courts in each of the fortified cities, these being the provincial capitals of every district (see on De 16:18).

2Ch 19:8-11. To the Priests and Levites.