2 Chronicles 5:11-14

When the priests came out from the Most Holy Place—for all the priests who were present had consecrated themselves, without keeping separate divisions— and all the Levitical singers, Asaph, Heman, and Jeduthun, with their sons and relatives, all clothed in fine linen, with cymbals, harps, and lyres, stood to the east of the altar, and with them one hundred and twenty priests who were sounding with trumpets, it happened, when the trumpet players and singers made one sound to praise and give thanks to the LORD, and when they lifted up their voice with the trumpets and cymbals and all the instruments of music and praised the LORD saying, “For He is good and His mercy endures forever,” that the house, the house of the LORD, was filled with a cloud. And the priests were not able to stand in order to serve because of the cloud, for the glory of the LORD had filled the house of God.