2 Chronicles 5:12
King James Version
“Also the Levites the singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brethren, arrayed in white linen, having cymbals and psalteries and harps, stood at the east end of the altar, and with them an hundred and twenty priests sounding with trumpets:)”
Context
9And they drew out the staves that the ends of the staves were seen from the ark before the oracle; but they were not seen without. And there it is unto this day.
10nothing in the ark save the two tables which Moses put at Horeb, when the LORD made with the children of Israel, when they came out of Egypt.
11And it came to pass, when the priests were come out of the holy (for all the priests present were sanctified, did not wait by course:
12Also the Levites the singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brethren, arrayed in white linen, having cymbals and psalteries and harps, stood at the east end of the altar, and with them an hundred and twenty priests sounding with trumpets:)
13It came even to pass, as the trumpeters and singers as one, to make one sound to be heard in praising and thanking the LORD; and when they lifted up voice with the trumpets and cymbals and instruments of musick, and praised the LORD, For good; for his mercy for ever: that the house was filled with a cloud, the house of the LORD;
14So that the priests could not stand to minister by reason of the cloud: for the glory of the LORD had filled the house of God.