Abū Mūsā al-Ash’arī reported God’s messenger as saying, “Keep refreshing your knowledge of the Qur’ān, for I swear by Him in whose hand my soul is that it is more liable to escape than camels which are tethered.”
Al-Hasan reported in mursal form that the Prophet said, “If anyone recites a hundred verses in a night the Qur’ān will not argue against him that night; if anyone recites two hundred verses in a night he will be recorded as having spent a night standing in prayer; and if anyone recites five hundred to a thousand verses in a night, in the morning he will have a reward equivalent to a qintār*. He was asked what a qintar was and replied that it was twelve thousand .
*This is the measure to which many different values have been ascribed.
Ibn Mas’ūd reported God’s messenger as saying, “It is wrong for one to say that he has forgotten such and such a verse, for he has been made to forget. Study the Qur’ān, for it is more apt to escape from men’s minds than animals.”
(Bukhārī and Muslim, Muslim adding "which are tethered”.)
Sa'īd b. al-Musayyib reported in mursal form that the Prophet said, “If anyone recites ten times ‘Say, He is God, One’, a palace will be built for him in paradise because of it; if anyone recites twenty times two palaces will be built for him in paradise because of it; and if anyone recites it thirty times three palaces will be built for him in paradise because of it.” ‘Umar b. al-Khattāb said, “I swear by God, messenger of God, that we shall then produce many palaces for ourselves;” to which he replied, “God's abundant grace is even more comprehensive than that.”
