Divrey Hayamim Bais 5:13-14

It came even to pass, as the trumpeters and meshorarim were as one, making kol echad (one voice, one sound) to be heard in praising and thanking HASHEM; and when they lifted up their voice with the trumpets and cymbals and musical instruments, and praised HASHEM, saying, Ki tov ki l'olam chasdo (For He is good; for His mercy endureth forever), that then the Beis was filled with an anan, even the Beis HASHEM, So that the Kohanim could not stand to minister by reason of the anan; for the Kavod HASHEM had filled the Beis HaElohim.