29:27 And Hezekiah commanded to offer the burnt offering upon the altar. And when the burnt offering began, the song of the {m} LORD began [also] with the trumpets, and with the instruments [ordained] {n} by David king of Israel.
(m) The psalm which David had appointed to be sung for thanksgiving.
(n) Which David had appointed to praise the Lord with.
29:27 The song - The psalms composed by David and Asaph. Even sorrow for sin must not put us out of tune for praising God. By faith we must even then rejoice in the Lord our righteousness, and our prayers and praises must attend with his offering, to be accepted only in the virtue of it.
29:20-36 As soon as Hezekiah heard that the temple was ready, he lost no time. Atonement must be made for the sins of the last reign. It was not enough to lament and forsake those sins; they brought a sin-offering. Our repentance and reformation will not obtain pardon but in and through Christ, who was made sin, that is, a sin-offering for us. While the offerings were on the altar, the Levites sang. Sorrow for sin must not prevent us from praising God. The king and the congregation gave their consent to all that was done. It is not enough for us to be where God is worshipped, if we do not ourselves worship with the heart. And we should offer up our spiritual sacrifices of praise and thanksgiving, and devote ourselves and all we have, as sacrifices, acceptable to the Father only through the Redeemer.