John Gills Exposition of the Bible Commentary - 1 Chronicles 16:37
So he left there, before the ark of the covenant of the Lord, Asaph and his brethren ,.... Whom he, that is, David, had appointed for the service of it: to minister before the ark continually ; in singing the praises of God: as every day's work required ; at the time of the morning and evening sacrifice, as Jarchi and Kimchi interpret it. read more
Matthew Henry's Complete Commentary - 1 Chronicles 16:37-43
The worship of God is not only to be the work of a solemn day now and then, brought in to grace a triumph; but it ought to be the work of every day. David therefore settles it here for a constancy, puts it into a method, which he obliged those that officiated to observe in their respective posts. In the tabernacle of Moses, and afterwards in the temple of Solomon, the ark and the altar were together; but, ever since Eli's time, they had been separated, and still continued so till the temple... read more