1 Chronicles 25:5-8

5All these were the sons of Heman, the king’s prophet. God had promised him these sons in order to make him prestigious. God gave Heman fourteen sons and three daughters.

6All of these were under the supervision of their fathers; they were musicians in the Lord’s temple, playing cymbals and stringed instruments as they served in God’s temple. Asaph, Jeduthun, and Heman were under the supervision of the king.

7They and their relatives, all of them skilled and trained to make music to the Lord, numbered two hundred eighty-eight.

8They cast lots to determine their responsibilities – oldest as well as youngest, teacher as well as student.