2 Chronicles 5:12,13
Also the Levites which were the singers, all of them of Asaph, of Heman, of Jeduthun, with their sons and their brothers, being 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:)
Torrey's Topical Textbook—AKJV