Charles Ellicott Commentary 2 Chronicles 31:2

"And Hezekiah appointed the courses of the priests and the Levites after their courses, every man according to his service, both the priests and the Levites, for burnt-offerings and for peace-offerings, to minister, and to give thanks, and to praise in the gates of the camp of Jehovah." — 2 Chronicles 31:2 (ASV)

The courses ... their courses. —Hezekiah restored the system of service in rotation, ascribed to David. (Compare to 2 Chronicles 8:14, according to the order of David.)

Every man according to his service. —See the same phrase in Numbers 7:5; Numbers 7:7. Literally, after the mouth (i.e., rule, prescription) of his service.

The priests and Levites. —Literally, to the priests and Levites. The words depend upon those which immediately precede. Septuagint, καὶ τὰς ἐφημερίας ἑκάστου κατὰ τὴν ἑαυτοῦ λειτουργίαν τοῖς ἱερεῦσιν καὶ τοῖς Λευίταις.

To minister ... praise. —The chronicler’s usual definition of the Levitical functions.

In the gates ... Lord. —Literally, in the gates of the camps of Jehovah. Compare to 1 Chronicles 9:18–19, where the phrase is explained.