These were the orderings of them in their service to come into the house of the LORD, according to their manner, under Aaron their father, as the LORD God of Israel had commanded him.

These are their courses according to their ministries, to come into the house of the Lord, and according to their manner under the hand of Aaron their father: as the Lord the God of Israel had commanded.

This is their ordering in their service to come into the house of Jehovah, according to their ordinance, through Aaron their father, as Jehovah the God of Israel had commanded him.

These are their appointments for their service, to come in to the house of Jehovah, according to their ordinance by the hand of Aaron their father, as Jehovah God of Israel, commanded them.

So they were put into their different groups, to take their places in the house of the Lord, in agreement with the rules made by Aaron their father, as the Lord, the God of Israel, had given him orders.

These were the orderings of them in their service, to come into the house of the LORD according to the ordinance given unto them by the hand of Aaron their father, as the LORD, the God of Israel, had commanded him.

These were their courses according to their ministries, so that they would enter into the house of the Lord in accord with their practice, under the hand of Aaron, their father, just as the Lord, the God of Israel, had instructed.

These were the orderings - i. e., "this was the numerical order fixed for their ministerial attendance in the house of the Lord - an attendance which was after the manner determined for them by their forefather Aaron, according to instructions which he received from God."

Under Aaron their father - That is, they followed the order and plans laid down by Aaron during his lifetime.

These [were] the orderings of them in their service to come into the house of the LORD, according to their manner, under (d) Aaron their father, as the LORD God of Israel had commanded him.
(d) By the dignity that God gave to Aaron.

These were the orderings of them,.... Their classes or courses into which they were divided:
in their service to come into the house of the Lord; to perform their service in the temple, according to their turns, and in course as fixed by lot; one class or course served one week, and then went out, and another came in, each consisting of 1000 men, see 1-Chronicles 23:4.
according to their manner; law, right, custom, here prescribed for them: under Aaron their father; that is, him who was high priest for the time being; who bore this name because his successor and representative, under whose inspection, direction, and authority, all the rest of the priests were, and whom they were to obey in all things:
as the Lord God of Israel had commanded him; to take care they should be done.

These are their official classes for their service (cf. 1-Chronicles 24:3), לבוא, so that they came (according to the arrangement thus determined) into the house of Jahve, according to their law, through Aaron their father (ancestor), i.e., according to the lawful arrangement which was made by Aaron for their official service, as Jahve the God of Israel had commanded. This last clause refers to the fact that the priestly service in all its parts was prescribed by Jahve in the law.
(Note: Of these twenty-four classes, each one had to perform the service during a week in order, and, as may be gathered with certainty from 2-Kings 11:9 and 2-Chronicles 23:9, from Sabbath to Sabbath. Josephus bears witness to this division in Antt. vii. 14. 7: διέμεινεν οὗτος ὁ μερισμὸς ἄχρι τῆς σήμερον ἡμέρας. Herzfeld, on the contrary (Geschichte des Volks Israel von der Zerstrung des ersten Tempels, Bd. i. S. 381ff.), following de Wette and Bramb., has declared the reference of this organization of the priests to David to be an invention of the chronicler, and maintains that the twenty-four classes of priests were formed only after the exile, from the twenty-two families of priests who returned out of exile with Zerubbabel. But this baseless hypothesis is sufficiently refuted by the evidence adduced by Movers, die bibl. Chron. S. 279ff., for the historical character of the arrangements attributed to David, and described in our chapters; but the remarks of Oehler in Herzog's Realenc. xii. S. 185f. may also be compared. An unimpeachable witness for the prae-exilic origin of the division of the priests into twenty-four orders is the vision of Ezekiel (Ezekiel 8:16-18), where the twenty-five men who worship the sun in the priests' court represent the twenty-four classes of priests, with the high priest at their head. In Nehemiah 12:1-7 and Nehemiah 12:12-21 also unimpeachable evidence for the Davidic origin of the division of the priests into twenty-four classes is to be found, as we shall show in treating of these passages.)

These, &c. - In this order and method they were to come to perform the offices of the temple. To come - To come into the temple every sabbath - day, and to continue there 'till the next sabbath, when they were relieved by others. Aaron - Under the direction of the high - priests, whom he calls Aaron, because he represented his person and executed his office, and their father, because of the authority which by God's appointment he had over them.