1 Chronicles 25:7-11

Their number who were trained in singing to the Lord, with their relatives, all who were skillful, was 288. Divisions of the Musicians

They cast lots for their duties, all alike, the small as well as the great, the teacher as well as the pupil.

Now the first lot came out for Asaph to Joseph, the second for Gedaliah, he with his relatives and sons were twelve;

the third to Zaccur, his sons and his relatives, twelve;

the fourth to Izri, his sons and his relatives, twelve;