1 Chronicles 25:17

The tenth to Shimei, he, his sons, and his brethren, were twelve:

The tenth lot drawn for the courses of sanctuary musicians fell to Shimei. His course was made up of himself together with his sons and his brethren, numbering twelve persons in all. This appointment belonged to David's orderly arrangement of the musicians into successive courses. Each course served under trained leadership with clearly defined duties in the sanctuary service.