Then David and the officers of the army also set apart for the service some of the sons of Asaph, and of Heman, and of Jeduthun, those who prophesied with lyres, harps, and cymbals. The number of those who did the work according to their service was:
For Jeduthun, the sons of Jeduthun: Gedaliah, Zeri, Jeshaiah, Hashabiah, and Mattithiah, six, under the guidance of their father Jeduthun, who prophesied with the lyre in giving thanks and praise to the Lord.
All these were under the direction of their father for the music in the house of the Lord with cymbals, harps, and lyres, for the service of the house of God by decree of the king: Asaph, Jeduthun, and Heman.
So they gathered their brothers together and consecrated themselves and entered in as the king commanded by the words of the Lord in order to cleanse the house of the Lord.