The courses... their courses. — Hezekiah restored the system of service in rotation, ascribed to David. (Comp. 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. LXX., 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. Comp. 1 Chronicles 9:18-19, where the phrase is explained.