Concerning the divisions of the porters - There were four thousand (1Ch 23:6), all taken from the families of the Kohathites and Merarites (1Ch 26:14), divided into twenty-four courses - as the priests and musicians.
Meshelemiah the son of Kore, of the sons of Asaph - Seven sons of Meshelemiah are mentioned (1Ch 26:2), whereas eighteen are given (1Ch 26:9), but in this latter number his relatives are included.