David assembled all the leaders of Israel and the priests and the Levites.
Here we have, I. The crown entailed, according to the divine appointment, Ch1 23:1. David made Solomon king, not to reign with him, or reign under him, but only to reign after him. This he did, 1. When he was old and full of days. He was but seventy years old when he died, and yet he was full of days, satur dierum - satisfied with living in this world.
Commenting on 1 Chronicles 23:1-23
And he gathered together all the princes of Israel,.... Ordered them to be assembled, partly to acquaint them with his will and pleasure, that Solomon should succeed him in the kingdom; and partly to settle the order of the work and service of the temple; and therefore these were convened with the priests and Levites; to assign to them their respective places and offices.
NUMBER AND DISTRIBUTION OF THE LEVITES. (Ch1 23:2-6) he gathered together all the princes of Israel--All important measures relating to the public interest were submitted for consideration to a general assembly of the representatives of the tribes (Ch1 13:1; Ch1 15:25; Ch1 22:17; 1Ch. 26:1-32).