«وَإِمَّا بِذِكْرِ الْخَاصِّ بَعْدَ الْعَامِّ»
A further form of expansion mentions a specific member after a general class.
The particular is already included within the general expression. Its additional mention therefore need not supply a new item of information; instead it draws attention to the member's special merit or significance.
Naming a distinguished part separately after stating a rule about the whole directs particular attention to it. That purpose distinguishes rhetorical specification from needless repetition.