37 So David left Asaph and his brethren there before the ark of the covenant of the Lord to minister continually before the ark as each day required, 38 and also O'bed-e'dom and his sixty-eight brethren; while O'bed-e'dom, the son of Jedu'thun, and Hosah were to be gatekeepers. 39 And he left Zadok the priest and his brethren the priests before the tabernacle of the Lord in the high place that was at Gibeon, 40 to offer burnt offerings to the Lord upon the altar of burnt offering continually morning and evening, according to all that is written in the law of the Lord which he commanded Israel. 41 With them were Heman and Jedu'thun, and the rest of those chosen and expressly named to give thanks to the Lord, for his steadfast love endures for ever. 42 Heman and Jedu'thun had trumpets and cymbals for the music and instruments for sacred song. The sons of Jedu'thun were appointed to the gate. 43 Then all the people departed each to his house, and David went home to bless his household.
Matthew Henry's Commentary on 1 Chronicles 16:37-43
Commentary on 1 Chronicles 16:37-43
(Read 1 Chronicles 16:37-43)
The worship of God ought to be the work of every day. David put it into order. At Jerusalem, where the ark was, Asaph and his brethren were to minister before the ark continually, with songs of praise. No sacrifices were offered there, nor incense burnt, because the altars were not there; but David's prayers were directed as incense, and the lifting up of his hands as the evening sacrifice. So early did spiritual worship take place of ceremonial. Yet the ceremonial worship, being of Divine institution, must by no means be omitted; therefore at Gibeon, at the altars, the priests attended; for their work was to sacrifice and burn incense; and that they did continually, morning and evening, according to the law of Moses. As the ceremonies were types of the mediation of Christ, the observance of them was of great consequence. The attendance of his appointed ministers is right in itself, and encourages the people.