1 Chronicles 25:2-3

Of the sons of Asaph: Zaccur, Joseph, Nethaniah and Asharelah; the sons of Asaph were under the direction of Asaph, who prophesied under the direction of the king. Of Jeduthun, the sons of Jeduthun: Gedaliah, Zeri, Jeshaiah, Shimei, Hashabiah and Mattithiah, six, under the direction of their father Jeduthun with the harp, who prophesied in giving thanks and praising the LORD.