1 Chronicles 25:5-8

5All these were the sons of Heman the king’s seer according to the promise of God to lift up a horn. God gave Heman 14 sons and three daughters.

6All these were under the direction of their father for singing in the House of Adonai with cymbals, harps and lyres for the avodah of the House of God under the hand of the king. Asaph, Jeduthun, and Heman along with

7with their kinsmen all trained and skillfull singers of Adonai, numbered 288.

8They cast lots for their divisions on the principal of small and great alike, teacher as well as student.