Answer:
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The Qur’an was memorized by many Sahaba and written on bones, leaves, leather, etc.
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The Prophet (SAAS) had scribes like Zayd ibn Thabit who wrote revelations.
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It was not compiled into a single book during his life because:
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Revelation continued until his death.
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Verses were revealed at different times and events.
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The arrangement was given by Jibreel (AS) later.
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