حَدَّثَنَا أَبُو مُعَاوِيَةَ حَدَّثَنَا الْأَعْمَشُ عَنْ شَقِيقٍ عَنْ عَبْدِ اللَّهِ قَالَ تَعَاهَدُوا هَذِهِ الْمَصَاحِفَ وَرُبَّمَا قَالَ الْقُرْآنَ فَلَهُوَ أَشَدُّ تَفَصِّيًا مِنْ صُدُورِ الرِّجَالِ مِنْ النَّعَمِ مِنْ عُقُلِهِ قَالَ وَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَقُلْ أَحَدُكُمْ إِنِّي نَسِيتُ آيَةَ كَيْتَ وَكَيْتَ بَلْ هُوَ نُسِّيَ
مسند امام احمد بن حنبل · Hadith 3620
It was narrated that 'Abdullah said: Keep refreshing your knowledge of these Mushafs - or he said, the Qur'an - for it is more inclined to escape from the hearts of men than camels from their ropes. And the Messenger of Allah (PBUH) said: "No one of you should say, I have forgotten such and such a verse; rather he has been caused to forget."
Sanad
حَدَّثَنَا أَبُو مُعَاوِيَةَ حَدَّثَنَا الْأَعْمَشُ عَنْ شَقِيقٍ عَنْ عَبْدِ اللَّهِ