Mattaniah.

Nehemiah 12:8, 9
The Levites were Jeshua, Binnui, Kadmiel, Sherebiah, Judah, and Mattaniah, who, with his associates, led the songs of thanksgiving. . . .

Nehemiah 11:17-19
Mattaniah son of Mica, the son of Zabdi, the son of Asaph, who led in thanksgiving and prayer; Bakbukiah, second among his associates; and Abda son of Shammua, the son of Galal, the son of Jeduthun. . . .

1 Chronicles 9:14-17
From the Levites: Shemaiah son of Hasshub, the son of Azrikam, the son of Hashabiah, a descendant of Merari; . . .

keeping.

1 Chronicles 23:32
So the Levites were to carry out the responsibilities for the Tent of Meeting and the Holy Place, and, under their brothers the descendants of Aaron, the service of the house of the LORD.

1 Chronicles 26:12
These divisions of the gatekeepers, through their chief men, had duties for ministering in the house of the LORD, just as their brothers did.

Isaiah 21:8
Then the lookout shouted, "Day after day, O lord, I stand on the watchtower; night after night I stay at my post.

thresholds.