So if they argue with you (O Muhammad), tell them: “I have submitted myself entirely to Allah and so have those who follow me.” Then ask those who are given the Book and those who are illiterates: “Will you also submit yourselves to Allah?” If they become Muslims they shall be rightly guided but if they turn back, you need not worry, because your sole responsibility is to convey the Message. Allah is watching all His servants very closely.
Meaning:-
Illiterate: having little or no education; especially : unable to read or write.
Convey: give information to someone.