1. Chronik 23:29

And to offer all burnt sacrifices unto the Lord,.... This was the work of the priests to offer such sacrifices, and not the Levites; but the meaning is, according to the Targum, and so Kimchi, that these not only sung the praises of God morning and evening, but at all times when burnt offerings were offered to the Lord; besides, some of them helped the priests at such times in slaying the sacrifices, and bringing them to the altar: and especially their service was requisite in the sabbaths, in the new moons, and on the set feasts, by number; because, besides the daily sacrifices, there were additional offerings at those times: according to the order commanded unto them continually before the Lord; see Num 28:1.

David, having given charge concerning the building of the temple, in this and the following chapters settles the method of the temple-service and puts into order the offices and officers of it. In the late irregular times, and during the wars in the beginning of his reign, we may suppose that, though the Levitical ordinances were kept up, yet it was not in the order, nor with the beauty and exactness, that were desirable. Now David, being a prophet, as well as a prince, by divine warrant and direction, "set in order the things that were wanting." In this chapter we are informed, I. He declared Solomon to be his successor, (Ch1 23:1). II. He numbered the Levites, and appointed them to their respective offices (Ch1 23:2-5). III. He took an account of the several families of the Levites (v. 6-23). IV. He made a new reckoning of them from twenty years old, and appointed them their work (Ch1 23:24-32). And in this he prepared for the temple as truly as when he laid up gold and silver for it; for the place is of small account in comparison with the work.