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Number and Services of Musicians
2Of 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. 3Of Jeduthun, the sons of Jeduthun: Gedaliah, Zeri, Jeshaiah, Shimei, Hashabiah, and Mattithiah, six in all, under the direction of their father Jeduthun with the harp, who prophesied in giving thanks and praising the Lord.
1 Chronicles 25:2-3 (NASB)