1 Chronicles 25:5-8

5All these sons of Heman the king’s seer were given him through the promises of God to exalt him, for God had given Heman fourteen sons and three daughters.

6All these were under the direction of their fathers for the music of the house of the LORD with cymbals, harps, and lyres, for the service of the house of God.

Asaph, Jeduthun, and Heman were under the direction of the king. 7Together with their relatives, who were all trained and skillful in the songs of the LORD, they numbered 288. 8They cast lots for their duties, young and old alike, teacher as well as pupil.