The well-known report about Umar bin Khattab’s conversion to Islam shows that large passages of the Qur’an had already been written down even at the early time, in Mecca, long before the hijra, when the Prophet was still in the house of Arqam (one of the first converts in Islam). It was surah Taha (chapter 20) of the Qur’an which Umar read in the sheet of his sister that brought him to Islam. – [Ibn Hisham, pp.156-157]

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