2 Chronicles 23:4

He commanded them, saying, “This is what you must do: a third of you, who come in on the Sabbath, shall be keepers of the watch of the king’s house;

He set the Levites in Yahweh’s house with cymbals, with stringed instruments, and with harps, according to the commandment of David, of Gad the king’s seer, and Nathan the prophet; for the commandment was from Yahweh by his prophets.

Prepare yourselves after your fathers’ houses by your divisions, according to the writing of David king of Israel, and according to the writing of Solomon his son.

The gatekeepers: Shallum, Akkub, Talmon, Ahiman, and their brothers (Shallum was the chief),

So he left Asaph and his brothers there before the ark of Yahweh’s covenant, to minister before the ark continually, as every day’s work required;

David divided them into divisions according to the sons of Levi: Gershon, Kohath, and Merari.

I have set watchmen on your walls, Jerusalem. They will never be silent day nor night. You who call on Yahweh, take no rest,

and I brought them into Yahweh’s house, into the room of the sons of Hanan the son of Igdaliah, the man of God, which was by the room of the princes, which was above the room of Maaseiah the son of Shallum, the keeper of the threshold.

So the Levites and all Judah did according to all that Jehoiada the priest commanded: and they each took his men, those who were to come in on the Sabbath; with those who were to go out on the Sabbath; for Jehoiada the priest didn’t dismiss the shift.

The chiefs of the Levites: Hashabiah, Sherebiah, and Jeshua the son of Kadmiel, with their brothers close to them, to praise and give thanks, according to the commandment of David the man of God, watch next to watch.

and his brothers, Shemaiah, Azarel, Milalai, Gilalai, Maai, Nethanel, Judah, and Hanani, with the musical instruments of David the man of God; and Ezra the scribe was before them.

When the days of his service were fulfilled, he departed to his house.

For no prophecy ever came by the will of man: but holy men of God spoke, being moved by the Holy Spirit.

This is the blessing with which Moses the man of God blessed the children of Israel before his death.

“Yahweh’s Spirit spoke by me. His word was on my tongue.

Behold, a man of God came out of Judah by Yahweh’s word to Bethel; and Jeroboam was standing by the altar to burn incense.

The two companies of you, even all who go out on the Sabbath, shall keep the watch of Yahweh’s house around the king.

“Go up to Hilkiah the high priest, that he may count the money which is brought into Yahweh’s house, which the keepers of the threshold have gathered of the people.

Their brothers, in their villages, were to come in every seven days from time to time to be with them:

and with them Heman and Jeduthun with trumpets and cymbals for those that should sound aloud, and with instruments for the songs of God; and the sons of Jeduthun to be at the gate.

four thousand were doorkeepers, and four thousand praised Yahweh with the instruments which I made for giving praise.”

These were the divisions of the sons of Aaron. The sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar.

This was their ordering in their service, to come into Yahweh’s house according to the ordinance given to them by Aaron their father, as Yahweh, the God of Israel, had commanded him.

Eastward were six Levites, northward four a day, southward four a day, and for the storehouse two and two.

“All this”, David said, “I have been made to understand in writing from Yahweh’s hand, even all the works of this pattern.”

When the priests had come out of the holy place (for all the priests who were present had sanctified themselves, and didn’t keep their divisions;

He appointed, according to the ordinance of David his father, the divisions of the priests to their service, and the Levites to their offices, to praise and to minister before the priests, as the duty of every day required; the doorkeepers also by their divisions at every gate, for David the man of God had so commanded.

But Yahweh’s word came to Shemaiah the man of God, saying,

Hezekiah appointed the divisions of the priests and the Levites after their divisions, every man according to his service, both the priests and the Levites, for burnt offerings and for peace offerings, to minister, to give thanks, and to praise in the gates of Yahweh’s camp.

Also they were over the bearers of burdens, and directed all who did the work in every kind of service. Of the Levites, there were scribes, officials, and gatekeepers.

So the service was prepared, and the priests stood in their place, and the Levites by their divisions, according to the king’s commandment.

They set the priests in their divisions, and the Levites in their courses, for the service of God, which is at Jerusalem, as it is written in the book of Moses.

There was in the days of Herod, the king of Judea, a certain priest named Zacharias, of the priestly division of Abijah. He had a wife of the daughters of Aaron, and her name was Elizabeth.

Now while he executed the priest’s office before God in the order of his division

When he had removed him, he raised up David to be their king, to whom he also testified, ‘I have found David the son of Jesse, a man after my heart, who will do all my will.’

For David, after he had in his own generation served the counsel of God, fell asleep, was laid with his fathers, and saw decay.

Let all things be done decently and in order.

But you, man of God, flee these things, and follow after righteousness, godliness, faith, love, perseverance, and gentleness.

Now if perfection was through the Levitical priesthood (for under it the people have received the law), what further need was there for another priest to arise after the order of Melchizedek, and not be called after the order of Aaron?