وَلَا الْقَارِئُ خَلْفَ الْأُمِّيِّ،
Meaning: A person capable of the required Qur’anic recitation does not follow an imam incapable of that recitation.
In this juristic context, qārī means one able to recite the requisite Qur’an in prayer, while ummī refers to one unable to perform that recitation; the term is not merely a general literacy label.