Explanation

Hazrat Usman colleted the verses of Quran.

Hazrat Usman (R.A), the third caliph of Islam was martyred at the age of 82 

Hazrat Usman was the first Hafiz of the Holy Quran. people who have completely memorized the Quran is called Hafiz Quran. 

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Hazrat Ali (R.A), the fourth caliph of Islam was martyred at the age of 60.