1 Chronicles 12:27

And Jehoiada, chief of the family of Aaron, and with him three thousand, seven hundred men;

2 Kings 11:4

Then in the seventh year, Jehoiada sent for the captains of hundreds of the Carians, and the armed men, and taking them into the house of the Lord, made an agreement with them, and made them take an oath in the house of the Lord, and let them see the king's son.

2 Kings 11:9

And the captains of hundreds did as Jehoiada the priest gave them orders; every one took with him his men, those who came in and those who went out on the Sabbath, and they came in to Jehoiada the priest.

2 Kings 25:18

And the captain of the armed men took Seraiah, the chief priest, and Zephaniah, the second priest, and the three door-keepers;

1 Chronicles 6:49-57

But Aaron and his sons made offerings on the altar of burned offering, and on the altar of perfume, for all the work of the most holy place, and to take away the sin of Israel, doing everything ordered by Moses, the servant of God.

1 Chronicles 9:20

In the past Phinehas, the son of Eleazar, had been ruler over them; may the Lord be with him!

1 Chronicles 27:17

Of Levi, Hashabiah, the son of Kemuel; of Aaron, Zadok;

Treasury of Scripture Knowledge

Summary

And Jehoiada was the leader of the Aaronites, and with him were three thousand and seven hundred;

Bible References

The leader

1 Chronicles 9:20
In the past Phinehas, the son of Eleazar, had been ruler over them; may the Lord be with him!
2 Kings 11:4
Then in the seventh year, Jehoiada sent for the captains of hundreds of the Carians, and the armed men, and taking them into the house of the Lord, made an agreement with them, and made them take an oath in the house of the Lord, and let them see the king's son.
2 Kings 25:18
And the captain of the armed men took Seraiah, the chief priest, and Zephaniah, the second priest, and the three door-keepers;

Aaronites

1 Chronicles 6:49
But Aaron and his sons made offerings on the altar of burned offering, and on the altar of perfume, for all the work of the most holy place, and to take away the sin of Israel, doing everything ordered by Moses, the servant of God.
1 Chronicles 27:17
Of Levi, Hashabiah, the son of Kemuel; of Aaron, Zadok;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain