Ezra
1 Chronicles 23:28ESV·traditional attribution

For their duty was to assist the sons of Aaron for the service of the house of the LORD, having the care of the courts and the chambers, the cleansing of all that is holy, and any work for the service of the house of God.

Matthew Henry Presbyterian @wholebiblehenry

Here is, I. An alteration made in the computation of the effective men of the Levites - that whereas, in Moses's time, they were not enlisted, or taken into service, till they were thirty-years old, nor admitted as probationers till twenty-five (Num 8:24), David ordered, by direction from God, that they should be numbered for the service of the house of the Lord, from the...

Commenting on 1 Chronicles 23:24-32

John Gill Reformed Baptist @doctorgill

And to stand every morning to thank and praise the Lord,.... The office of others of them was to sing the praises of God, both vocally and with instruments of music, at the time of the morning sacrifice: and likewise at even; at the time of the evening sacrifice, by way of thankfulness for the mercies of the night and of the day.

Geneva Bible Notes Reformed @genevanotes

Because their office [was] to wait on the sons of Aaron for the service of the house of the LORD, in the courts, and in the chambers, and in the purifying of all holy things, and the work of the service of the house of God; (f) In washing and cleansing all the holy vessels.