The Gibeonites, who were devoted to this service by Joshua and the princes of his time, Joshua 9:21, and are said to be appointed by David and his princes, because they were confirmed by them in their former office, and more particularly applied to the several services of the temple; though this be not distinctly related in 1Ch 24 1Ch 25 1Ch 26, because his business there was to give an account only of the new constitutions and alterations made by David in those matters.
Related Commentaries of Ezra 8:20
Ezra 8:20
20 Also of the Nethinims, whom David and the princes had appointed for the service of the Levites, two hundred and twenty Nethinims: all of them were expressed by name.