one of the early Muslims who kept a codex of the Qur'an before the Uthmanic codex became standard (used today). His codex contains many variants with the Uthmanic text. ibn Mas'ud was well-versed in the Qur'an was was taught by Muhammad personally to recite the Qur'an. See The Collection of the Qur'an -- from the hadiths for more details.
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