Verses 41, 42. - Comparing these verses with vers. 4-6 and 37-40, it may be supposed that we are intended to understand that of all who were set apart and who had been expressed by name (as e.g.1 Chronicles 15:4-24), some were now formally appointed to serve before the ark, and some in the tabernacle at Gibeon. The confusion existing in these verses by the repetition of the preposition with, and the proper names Heman and Jeduthun, betrays some corruptness of text. The Septuagint does not show them in the latter verse. The sons of Jeduthun are found in 1 Chronicles 25:3.
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.
he left Heman and Jeduthun: or Ethan, two principal singers:
and the rest that were chosen, who were expressed by name; see 1 Chronicles 16:18.
to give thanks to the Lord, because his mercy endureth for ever; to praise him for his benefits, flowing from his grace and mercy continually.