1 Chronicles 25

5. Heman the king's seer--The title of "seer" or "prophet of David" is also given to Gad ( 1 Chronicles 21:9 ), and to Jeduthun ( 2 Chronicles 29:14 2 Chronicles 29:15 ), in the words (Margin, "matters") of God.
to lift up the horn--that is, to blow loudly in the worship of God; or perhaps it means nothing more than that he presided over the wind instruments, as Jeduthun over the harp. Heman had been appointed at first to serve at Gibeon ( 1 Chronicles 16:41 ). But his destination seems to have been changed at a subsequent period.
God gave to Heman fourteen sons and three daughters--The daughters are mentioned, solely because from their musical taste and talents they formed part of the choir ( Psalms 68:25 ).

6, 7. All these were under the hands of their father--Asaph had four sons, Jeduthun six, and Heman fourteen, equal to twenty-four; making the musicians with their brethren the singers, an amount of two hundred eighty-eight. For, like the priests and Levites, they were divided into twenty-four courses of twelve men each, equal to two hundred eighty-eight, who served a week in rotation; and these, half of whom officiated every week with a proportionate number of assistants, were skilful and experienced musicians, capable of leading and instructing the general musical corps, which comprised no less than four thousand ( 1 Chronicles 23:5 ).

1 Chronicles 25:8-31 . THEIR DIVISION BY LOT INTO FOUR AND TWENTY ORDERS.

8. they cast lots, ward against ward--"Ward" is an old English word for "division" or "company." The lot was cast to determine the precedence of the classes or divisions over which the musical leaders presided; and, in order to secure an impartial arrangement of their order, the master and his assistants, the teacher and his scholars, in each class or company took part in this solemn casting of lots. In the first catalogue given in this chapter the courses are classed according to their employment as musicians. In the second, they are arranged in the order of their service.