Matthew Poole and continuators on 1 Chronicles 23:2

2 And he gathered together all the princes of Israel, with the priests and the Levites .

Partly to declare Gods Mind and his own Will that Solomon should be his Successor; and so to cut off the Claims and Pretences which others of his Sons might make to the Crown: and partly to acquaint them with those Directions which he had received from God by the Spirit, as appears from ch. 28. 11, &c. concerning the Establishment of a new Order and Method in the Ministration of the Priests and Levites in the Temple.