مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 2188
The Excellent Qualities of the Qur'an
وَعَنِ ابْنِ مَسْعُودٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: بئس مالأحدهم أَنْ يَقُولَ: نَسِيتُ آيَةَ كَيْتَ وَكَيْتَ بَلْ نُسِّيَ وَاسْتَذْكِرُوا الْقُرْآنَ فَإِنَّهُ أَشَدُّ تَفَصِّيًا مِنْ صُدُورِ الرِّجَالِ مِنَ النَّعَمِ . مُتَّفَقٌ عَلَيْهِ. وَزَادَ مُسلم: «بعقلها»
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”.)
Mishkat al-Masabih, 2188مُتَّفَقٌ عَلَيْهِ (الألباني)