These were the divisions of the gatekeepers

2 Chronicles 8:14
In keeping with the ordinances of his father David, Solomon appointed the divisions of the priests over their service, and the Levites for their duties to offer praise and to minister before the priests according to the daily requirement. He also appointed gatekeepers by their divisions at each gate, for this had been the command of David, the man of God.

1 Chronicles 9:17-27
These were the gatekeepers: Shallum, Akkub, Talmon, Ahiman, and their relatives. Shallum was their chief; / he was previously stationed at the King’s Gate on the east side. These were the gatekeepers from the camp of the Levites. / Shallum son of Kore, the son of Ebiasaph, the son of Korah, and his relatives from the Korahites were assigned to guard the thresholds of the Tent, just as their fathers had been assigned to guard the entrance to the dwelling of the LORD. …

Nehemiah 12:25-26
Mattaniah, Bakbukiah, Obadiah, Meshullam, Talmon, and Akkub were gatekeepers who guarded the storerooms at the gates. / They served in the days of Joiakim son of Jeshua, the son of Jozadak, and in the days of Nehemiah the governor and Ezra the priest and scribe.

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who were descendants of Korah

1 Chronicles 6:31-38
These are the men David put in charge of the music in the house of the LORD after the ark rested there. / They ministered with song before the tabernacle, the Tent of Meeting, until Solomon built the house of the LORD in Jerusalem. And they performed their duties according to the regulations given them. / These are the men who served, together with their sons. From the Kohathites: Heman the singer, the son of Joel, the son of Samuel, …

2 Chronicles 20:19
And the Levites from the Kohathites and Korahites stood up to praise the LORD, the God of Israel, shouting in a very loud voice.

Numbers 26:11
However, the line of Korah did not die out.

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and Merari.

Numbers 3:33-37
From Merari came the clans of the Mahlites and Mushites; these were the Merarite clans. / The number of all the males a month old or more was 6,200. / The leader of the families of the Merarites was Zuriel son of Abihail; they were to camp on the north side of the tabernacle. …

Numbers 4:29-33
As for the sons of Merari, you are to number them by their clans and families, / from thirty to fifty years old, counting everyone who comes to serve in the work of the Tent of Meeting. / This is the duty for all their service at the Tent of Meeting: to carry the frames of the tabernacle with its crossbars, posts, and bases, …

1 Chronicles 6:44-47
On the left were their kinsmen, the sons of Merari: Ethan the son of Kishi, the son of Abdi, the son of Malluch, / the son of Hashabiah, the son of Amaziah, the son of Hilkiah, / the son of Amzi, the son of Bani, the son of Shemer, …

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1 Chronicles 9:22-24
The number of those chosen to be gatekeepers at the thresholds was 212. They were registered by genealogy in their villages. David and Samuel the seer had appointed them to their positions of trust. / So they and their descendants were assigned to guard the gates of the house of the LORD—the house called the Tent. / The gatekeepers were stationed on the four sides: east, west, north, and south.

1 Chronicles 23:1-5
When David was old and full of years, he installed his son Solomon as king over Israel. / Then he gathered all the leaders of Israel, as well as the priests and Levites. / The Levites thirty years of age or older were counted, and the total number of men was 38,000. …

1 Chronicles 24:1-5
These were the divisions of the descendants of Aaron. The sons of Aaron were Nadab, Abihu, Eleazar, and Ithamar. / But Nadab and Abihu died before their father did, and they had no sons; so Eleazar and Ithamar served as priests. / With the help of Eleazar’s descendant Zadok and Ithamar’s descendant Ahimelech, David divided them according to the offices of their service. …

1 Chronicles 25:1-8
Additionally, David and the commanders of the army set apart some of the sons of Asaph, Heman, and Jeduthun to prophesy with the accompaniment of lyres, harps, and cymbals. The following is the list of the men who performed this service: / From the sons of Asaph: Zaccur, Joseph, Nethaniah, and Asarelah. These sons of Asaph were under the direction of Asaph, who prophesied under the direction of the king. / From the sons of Jeduthun: Gedaliah, Zeri, Jeshaiah, Shimei, Hashabiah, and Mattithiah—six in all—under the direction of their father Jeduthun, who prophesied with the harp, giving thanks and praise to the LORD. …

2 Chronicles 23:18-19
Moreover, Jehoiada put the oversight of the house of the LORD into the hands of the Levitical priests, whom David had appointed over the house of the LORD, to offer burnt offerings to the LORD as written in the Law of Moses, with rejoicing and song, as ordained by David. / He stationed gatekeepers at the gates of the house of the LORD, so that no one who was in any way unclean could enter.

2 Chronicles 31:14-15
Kore son of Imnah the Levite, the keeper of the East Gate, was in charge of the freewill offerings given to God, distributing the contributions to the LORD and the consecrated gifts. / Under his authority, Eden, Miniamin, Jeshua, Shemaiah, Amariah, and Shecaniah faithfully distributed portions to their fellow priests in their cities, according to their divisions, old and young alike.

Nehemiah 12:24-26
The leaders of the Levites were Hashabiah, Sherebiah, and Jeshua son of Kadmiel, along with their associates, who stood across from them to give praise and thanksgiving as one section alternated with the other, as prescribed by David the man of God. / Mattaniah, Bakbukiah, Obadiah, Meshullam, Talmon, and Akkub were gatekeepers who guarded the storerooms at the gates. / They served in the days of Joiakim son of Jeshua, the son of Jozadak, and in the days of Nehemiah the governor and Ezra the priest and scribe.