Of the sons of Asaph; Zaccur, and Joseph, and Nethaniah, and Asarelah, the sons of Asaph under the hands of Asaph, which prophesied according to the order of the king.

From the sons of Asaph: Zaccur, Joseph, Nethaniah, and Asarelah. These sons of Asaph were under the direction of Asaph, who prophesied under the direction of the king.