Is it true that Hazrat Mustafa saw was “Ummi”?
It’s mentioned in Surah Ankaboot verse 48 “ Rasool saw before revelation of Quran, never read any book nor he wrote anything”, which perhaps proves this. Please enlighten.

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He did not read or write before the revelation but this does not mean he could not read or write.

This lecture could help you understand more:

https://youtu.be/s5EhkPHJxDM