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.
And David divided them into courses according to the sons of Levi: Gershon, Kohath, and Merari.
For their office was to wait on the sons of Aaron for the service of the house of Jehovah, in the courts, and in the chambers, and in the purifying of all holy things, even the work of the service of the house of God;
for the showbread also, and for the fine flour for a meal-offering, whether of unleavened wafers, or of that which is baked in the pan, or of that which is soaked, and for all manner of measure and size;
and to stand every morning to thank and praise Jehovah, and likewise at even;
and to offer all burnt-offerings unto Jehovah, on the sabbaths, on the new moons, and on the set feasts, in number according to the ordinance concerning them, continually before Jehovah;
And the courses of the sons of Aaron (were these). The sons of Aaron: Nadab and Abihu, Eleazar and Ithamar.
This was the ordering of them in their service, to come into the house of Jehovah according to the ordinance (given) unto them by Aaron their father, as Jehovah, the God of Israel, had commanded him.