1 Chronicles 25:7

7 And their number, with their brethren -- taught in the song of Jehovah, all who are intelligent -- is two hundred, eighty and eight.

1 Chronicles 25:7 Meaning and Commentary

1 Chronicles 25:7

So the number of them, with their brethren
Who each of them had twelve with them, as after reckoned: that were instructed in the songs of the Lord;
taught how to sing them: [even] all that were cunning;
expert and well skilled in the science of singing: was two hundred and eighty eight;
for there being twenty four classes answerable to those of the priests, and twelve in each class, twelve times twenty four makes two hundred and eighty eight.

1 Chronicles 25:7 In-Context

5 all these [are] sons of Heman -- seer of the king in the things of God -- to lift up a horn; and God giveth to Heman fourteen sons and three daughters.
6 All these [are] by the side of their father in the song of the house of Jehovah, with cymbals, psalteries, and harps, for the service of the house of God; by the side of the king [are] Asaph, and Jeduthun, and Heman.
7 And their number, with their brethren -- taught in the song of Jehovah, all who are intelligent -- is two hundred, eighty and eight.
8 And they cause to fall lots -- charge over-against [charge], as well the small as the great, the intelligent with the learner.
9 And the first lot goeth out for Asaph to Joseph; [to] Gedaliah the second; he, and his brethren and his sons, twelve;
Young's Literal Translation is in the public domain.