1 Chronicles 25:6

“All these were under the hands of their father, for song in the house of the Lord, etc.] Instructed and directed by him in the performance of the service in the temple: with cymbals, psalteries, and harps, for the service of the house of God; which were the three principal instruments of music used in the temple service: according to the king’s order, to Asaph, Jeduthun, and Heman; who ordered and directed them what to sing, what tunes to make use of, and what instruments to play upon to those tunes.”

“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 (Ch1 23:5).”

“under the hands: Ch1 25:2, Ch1 25:3 for song: Ch1 25:1-3, Ch1 15:22, Ch1 23:5; Psa 68:25; Eph 5:19; Col 3:16 according to the king's order: Heb. by the hands of the king, Ch1 25:2 \*marg. Asaph: Ch1 25:1-4 1 Chronicles 25:7”

“Ch1 25:6 is the subscription to the enumeration, Ch1 25:2-5. כּל־אלּה are not the fourteen sons of Heman, but all the sons of Asaph, Jeduthun, and Heman. All these were under the direction of their fathers for song in the house of Jahve, with cymbals ... for the service in the house of God under the direction of the king, etc. אביהם is used distributively of each father of the sons named. Bertheau supplies after אביהם the name Heman, and thereby the first half of the verse contradicts the second, which he correctly understands to refer to the twenty-four persons enumerated. - In Ch1 25:7 the total number is given. Their number (the number) of the sons of Asaph, Jeduthun, and Heman (i.e., of…”