1 Chronicles 25:1, 6, 7

David, together with the commanders of the army, set apart some of the sons of Asaph, Heman and Jeduthun for the ministry of prophesying, accompanied by harps, lyres and cymbals. Here is the list of the men who performed this service

All these men were under the supervision of their father for the music of the temple of the LORD, with cymbals, lyres and harps, for the ministry at the house of God. Asaph, Jeduthun and Heman were under the supervision of the king.

Along with their relatives—all of them trained and skilled in music for the LORD—they numbered 288.