in unison when the trumpeters and the singers were to make themselves heard with one voice to praise and to glorify the Lord, and when they raised their voices accompanied by trumpets, cymbals, and other musical instruments, and when they praised the Lord saying, “He indeed is good for His kindness is everlasting,” then the house, the house of the Lord, was filled with a cloud,
4
Even the house of the Lord - Or, according to another reading from the Septuagint, which removes the superfluousness of these words, The…

It came even to pass ... thanking the Lord. — And the trumpeters and the minstrels were to sound aloud, as one man, with one s…

(See Gill on 2 Chronicles 5:1).

God took possession of the temple; he filled it with a cloud. In this way he signified his acceptance of this temple, to be the same to him as the …
Albert Barnes
AlbertBarnes