Divrey Hayamim Alef 25:1-2

Orthodox Jewish Bible

25 Moreover Dovid and the sarim of the tzava separated for avodah of the Bnei Asaph, and of Heman, and of Yedutun, who should prophesy with kinnorot, with nevalim, and with cymbals; and the number of the workmen according to their avodah (service) was;

² Of the Bnei Asaph; Zakkur, and Yosef, and Netanyah, and Asarelah, the Bnei Asaph under the hand of Asaph, which prophesied according to the order of HaMelech.