1 Chronicles 9:33
And of these there were singers, princes of the fathers of the Levites, who remained in the chambers free from other work; for they were employed in that work day and night.
1 Chronicles 6:31-33
And these are they whom David set over the service of song in the house of the LORD, after the ark had rest.
1 Chronicles 25:1-31
Moreover David and the captains of the host separated unto the ministry the sons of Asaph and of Heman and of Jeduthun, who should prophesy with harps, with psalteries, and with cymbals; and the number of men that were suitable for the work of their respective ministry was,
1 Chronicles 15:16-22
And David spoke to the chief of the Levites to appoint of their brethren as singers with instruments of music, with psalteries and harps and cymbals sounding, and to lift up their voice with joy.
1 Chronicles 16:4-6
And he appointed certain of the Levites to minister before the ark of the LORD and to record and to thank and praise the LORD God of Israel:
Ezra 7:24
Also unto you we cause it to be known, that regarding all of the priests and Levites, singers, porters, Nethinims, and ministers of the house of this God, no one shall be able to impose toll, tribute, or custom, upon them.
Nehemiah 11:17
And Mattaniah, the son of Micha, the son of Zabdi, the son of Asaph, was the principal to begin the thanksgiving in prayer; and Bakbukiah, the second among his brethren, and Abda, the son of Shammua, the son of Galal, the son of Jeduthun.
Nehemiah 11:22-23
The overseer of the Levites at Jerusalem was Uzzi, the son of Bani, the son of Hashabiah, the son of Mattaniah, the son of Micha of singers, the sons of Asaph, over the work of the house of God.
Psalm 134:1-2
Behold, bless ye the LORD, all ye slaves of the LORD, who by night stand in the house of the LORD.
Psalm 135:1-3
Halelu-JAH. Praise ye the name of the LORD; praise him, O ye slaves of the LORD.