1 Chronicles 9:33

Now these are the singers, heads of fathers’ households of the Levites, who lived in the chambers of the temple free from other service; for they were engaged in their work day and night.

1 Chronicles 6:31-33

Now these are those whom David appointed over the service of song in the house of the Lord, after the ark rested there.

Moreover, David and the commanders of the army set apart for the service some of the sons of Asaph and of Heman and of Jeduthun, who were to prophesy with lyres, harps and cymbals; and the number of those who performed their service was:

1 Chronicles 15:16-22

Then David spoke to the chiefs of the Levites to appoint their relatives the singers, with instruments of music, harps, lyres, loud-sounding cymbals, to raise sounds of joy.

1 Chronicles 16:4-6

He appointed some of the Levites as ministers before the ark of the Lord, even to celebrate and to thank and praise the Lord God of Israel:

Ezra 7:24

We also inform you that it is not allowed to impose tax, tribute or toll on any of the priests, Levites, singers, doorkeepers, Nethinim or servants of this house of God.

Nehemiah 11:17

and Mattaniah the son of Mica, the son of Zabdi, the son of Asaph, who was the leader in beginning the thanksgiving at 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

Now the overseer of the Levites in Jerusalem was Uzzi the son of Bani, the son of Hashabiah, the son of Mattaniah, the son of Mica, from the sons of Asaph, who were the singers for the service of the house of God.

Psalm 134:1-2

A Song of Ascents.
Behold, bless the Lord, all servants of the Lord,
Who serve by night in the house of the Lord!

Psalm 135:1-3

Praise the Lord!
Praise the name of the Lord;
Praise Him, O servants of the Lord,

Treasury of Scripture Knowledge

Summary

1 Chronicles 9:33

And these are the singers, chief of the fathers of the Levites, who remaining in the chambers were free: for they were employed in that work day and night.

The singers

Were free

Nehemiah 11:17

Employed

Psalm 134:1

Bible References