John Gills Exposition of the Bible Commentary - 1 Chronicles 16:39
And Zadok the priest, and his brethren the priests ,.... These he left, having appointed them to be before the tabernacle of the Lord, in the high place that was at Gibeon ; namely, the tabernacle of Moses, which was removed from Nob thither in the days of Saul, and continued there to the times of Solomon, 1 Chronicles 21:28 . 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