2 Chronicles 5:11-12

11And when the priests came out of the Holy Place (for all the priests who were present had consecrated themselves, without regard to their divisions, 12and all the Levitical singers, Asaph, Heman, and Jeduthun, their sons and kinsmen, arrayed in fine linen, with cymbals, harps, and lyres, stood east of the altar with 120 priests who were trumpeters;