Matthew Henry on 1 Chronicles 23:1-23
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. When he found himself going off, he made provision for the welfare of the kingdom after his decease, and pleased himself with the hopeful prospect of a happy settlement both in church and state. 2. He did it in parliament, in a solemn assembly of all the princes of Israel, which made Adonijah's attempt to break in upon Solomon's title and set…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Chronicles 23:4
twenty and four thousand were to set forward the work of the house of the Lord--They were not to preside over all the services of the temple. The Levites were subject to the priests, and they were superior to the Nethinim and other servants, who were not of the race of Levi. But they had certain departments of duty assigned, some of which are here specified.
Adam Clarke on 1 Chronicles 23:3
Thirty years and upward - The enumeration of the Levites made in the desert, Num 4:3, was from thirty years upwards to fifty years. In this place, the latter limit is not mentioned, probably because the service was not so laborious now; for the ark being fixed they had no longer any heavy burdens to carry, and therefore even an old man might continue to serve the tabernacle. David made another ordinance afterwards; see on Ch1 23:24-27 (note).
John Gill on 1 Chronicles 23:4
Of which twenty and four thousand were to set forward the work of the house of the Lord,.... To prepare for the work of the priests by slaying the sacrifices, flaying them, cutting them in pieces, and washing them, and bringing them to the altar; 1000 of these served weekly in their turns:
and six thousand were officers and judges: that acted as justices of the peace in the several parts of the country, heard causes and administered justice to the people, being trained up in and acquainted with the laws of God, civil as well as ecclesiastic; some were more properly judges, and others executioners of their sentence; see Deuteronomy 16:18.