2 Chronicles 5:11-12

It happened, when the priests were come out of the holy place, (for all the priests who were present had sanctified themselves, and did not keep their courses;

also the Levites who were the singers, all of them, even Asaph, Heman, Jeduthun, and their sons and their brothers, arrayed in fine linen, with cymbals and psalteries and harps, stood at the east end of the altar, and with them one hundred twenty priests sounding with trumpets;)