The Quran was revealed from god to a prophet via angel. The prophet would later on recite the Quran to his companions who would memorize and some would write it down as he is reciting it as they knew people would start forgetting it after the prophets death during the rein of his companion Othman it was decided that it is better to compile the whole Quran into one book and Yh here we have it

And all muslims beleive that the Quran was revealed from god as it is a pillar of Islam and you are not considered Muslim if you don’t believe it

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