Why is Prophet Muhammad (sawas) called Al Nabi Al-Ummi?
There is a hadith explaining the reason and the meaning of the name, since people claim that he is called Ummi because of being unlettered (cant read and write).. i'll try to translate the hadith since i only have it in arabic, and if someone wants to correct the translation i'll be thankful:
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Jaafar bin Muhammad said that he asked Abu Jaffar Muhammad bin Ali al-Reda: Oh son of Allah's apostle, why is the prophet (sawas) called Ummi? And he said: What do poeple say? I said: they claim that he is called Ummi because he couldnt write and he said (a.s): They lied, may Allah's curse be upon them. Allah swt says in the Quran: It is He who has sent among the unlettered a Messenger from themselves reciting to them His verses and purifying them and teaching them the Book and wisdom - although they were before in clear error - Surat Al-Jumu`ah: 2 Then how can he teach them what he cant? By Allah the prophet (sawas) was reading
Bihar Al-Anwar v.16 p.132