33 These are the singers, heads of fathers' (houses) of the Levites, (who lived) in the rooms (and were) free (from other service); for they were employed in their work day and night.
*Minor differences ignored. Grouped by changes, with first version listed as example.
The singers - No names follow, and it is thought that they have fallen out.
Were free - "Free," i. e. from any special duties besides those of supervision, which was so arranged among the overseers that someone exercised it during every part of both day and night.
And these [are] the singers, chief of the fathers of the Levites, [who remaining] in the chambers (i) [were] free: for they were employed in [that] work day and night.
(i) But were continually occupied in singing praises to God.
And these are the singers, chief of the fathers of the Levites,.... Others of them were employed in singing, and were masters of the song, and presided in that service, see 1-Chronicles 6:31 who remaining
in the chambers were free; from all other work and service; and there they abode, even in the chambers of the temple, that they might be near to perform their work, and not be defiled, and made unfit for it:
for they were employed in that work day and night; some or other of them, either in composing or singing psalms and hymns, or teaching others how to sing them.
These - Others of the Levites; of whose several offices he had spoken before. Are - Or rather, were; which is understood, all along in the foregoing and following verses. Chambers - That they might be ready to come whensoever they were called to the service of God in the tabernacle. Free - From all trouble and employment, that they might wholly attend upon the proper work. That work - Either composing or ordering sacred songs; or actually singing; or teaching others to sing them. Day and night - Continually, and particularly in the morning and evening, the two times appointed for solemn service. Thus was God continually praised, as it is fit he should be, who is continually doing us good.
*More commentary available at chapter level.