2 Chronicles 5:11-12

11When the priests came out of the Holy Place (for all the priests who were present had sanctified themselves [separating themselves from everything unclean], without regard to their assigned divisions),

12and all of the Levitical singers, Asaph, Heman, and Jeduthun, with their sons and relatives, clothed in fine linen, with cymbals, harps, and lyres were standing at the east end of the altar, and with them a hundred and twenty priests blowing trumpets