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”.)
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.”
Ibn ‘Umar reported the Prophet as saying, “He who studies the Qur’ān is like the owner of tethered camels. If he pays attention to them he keeps hold of them, but if he lets them loose they go away."
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.
