1 Chronicles 12:27

Jehoiada the chief officer of [the house of] Aaron, and with him, three thousand seven hundred.

2 Kings 11:4

But in the seventh year Jehoiada sent and took the commanders of the hundreds of the Carites and the runners, and he brought them to himself to the temple of Yahweh. Then he {made} a covenant with them and made them swear in the house of Yahweh and showed them the son of the king.

2 Kings 11:9

So the commanders of hundreds did according to all that Jehoiada the priest commanded, and each took his men {who went off duty on the Sabbath} and those {who came on duty on the Sabbath}, and they came to Jehoiada the priest.

2 Kings 25:18

Then the commander of the imperial guard took Seraiah the chief priest, Zephaniah the second priest, and three of the threshold keepers.

1 Chronicles 6:49-57

But Aaron and his sons made offerings on the altar of burnt offering and on the altar of incense for all the work of the most holy place, and to make atonement for Israel, according to all that Moses the servant of God had commanded.

1 Chronicles 9:20

And Phinehas the son of Eleazar was the leader over them {in time past}; Yahweh [was] with him.

1 Chronicles 27:17

For Levi: Hashabiah the son of Kemuel. For 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
And Phinehas the son of Eleazar was the leader over them {in time past}; Yahweh [was] with him.
2 Kings 11:4
But in the seventh year Jehoiada sent and took the commanders of the hundreds of the Carites and the runners, and he brought them to himself to the temple of Yahweh. Then he {made} a covenant with them and made them swear in the house of Yahweh and showed them the son of the king.
2 Kings 25:18
Then the commander of the imperial guard took Seraiah the chief priest, Zephaniah the second priest, and three of the threshold keepers.

Aaronites

1 Chronicles 6:49
But Aaron and his sons made offerings on the altar of burnt offering and on the altar of incense for all the work of the most holy place, and to make atonement for Israel, according to all that Moses the servant of God had commanded.
1 Chronicles 27:17
For Levi: Hashabiah the son of Kemuel. For Aaron, Zadok.