2 Chronicles 29:25

“And he set the Levites in the house of the Lord with cymbals, with psalteries, and with harps, etc.] To play upon, which were the three principal instruments of music used in religious worship, and what had been disused in the times of Ahaz: according to the commandment of David, and of Gad the king’s seer, and Nathan the prophet; this sort of music was not commanded by the law of Moses, but was directed to by David under a divine influence, and was approved of by the prophets of the Lord here mentioned: for so was the commandment of the Lord by his prophets; the Targum is, “for by the Word of the Lord was the commandment by the hand of the prophets.””

“And he set: Ch1 9:33, Ch1 15:16-22, Ch1 16:4, Ch1 16:5, Ch1 16:42, Ch1 25:1-7 according: Ch2 8:14, Ch2 35:15; Ch1 23:5, Ch1 28:12, Ch1 28:19 Gad: Sa2 24:11; Ch1 21:9, Ch1 29:29 Nathan: Sa2 7:2-4, Sa2 12:1-7 for so was: Ch2 30:12 of the Lord by his prophets: Heb. by the hand of the Lord, by the hand of his prophets. 2 Chronicles 29:26”

“Hezekiah, moreover, restored again the music with which the Levites were wont to accompany the sacrificial act, and which David, with the prophets Gad and Nathan, had arranged. The ו consec. with ויּעמד expresses the secution of thought, and Ch2 29:25 corresponds to the Ch2 29:21. First, the beasts to be sacrificed were prepared for the sacrifice, and then to the Levites was committed the performance of instrumental and vocal music during the sacrificial act. In reference to the musical instruments, see on Ch1 15:16. The Levites were appointed to sing, "according to the command of David;" but this command was בּיד, by interposition of Jahve, viz., given by His prophets. David had…”