Sahih al-Bukhari 5037b
Sahih al-Bukhari · Book 66: Virtues of the Qur'an · Forgetting the Qur'an. And can one say: “I forgot such and such a Verse?
Narrated Hisham:
حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدِ بْنِ مَيْمُونٍ ، حَدَّثَنَا عِيسَى ، عَنْ هِشَامٍ ، وَقَالَ، أَسْقَطْتُهُنَّ مِنْ سُورَةِ كَذَا. تَابَعَهُ عَلِيُّ بْنُ مُسْهِرٍ وَعَبْدَةُ عَنْ هِشَامٍ .
(The same Hadith as 6.556, adding): which I missed (modifying the Verses).