Matthew Poole and continuators on 2 Chronicles 23:2

2 And they went about in Judah, and gathered the Levites out of all the cities of Judah , and the chief of the fathers of Israel , and they came to Jerusalem.

Partly because they could do this without any suspicion, upon pretence of some solemn Feast; which time, it is probable, was chosen for this purpose: and partly because he knew them to be well affected to the cause of God and the King, to which they were obliged by the the two firmest ties, Conscience and Interest.

i. e. Both of the two Tribes, and of the ten Tribes, all which are called Israel; and he useth the name of Israel rather than that of Iudah; because there were now great numbers of the other Tribes incorporated with Israel; and these he estemed more faithful than many of Judah, having given better proofe of the truth of their Religion than they; and therefore he pick't out of the chief men of the other Tribes, as well as of Judah and Benjamin.