Sahih al-Bukhari 5039

Arabic

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ أَبِي وَائِلٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ مَا لأَحَدِهِمْ يَقُولُ نَسِيتُ آيَةَ كَيْتَ وَكَيْتَ‏.‏ بَلْ هُوَ نُسِّيَ ‏"‏‏.‏

English translation

Narrated `Abdullah:The Prophet (ﷺ) said, "Why does anyone of the people say, 'I have forgotten such-and-such Verses (of the Qur'an)?' He, in fact, is caused (by Allah) to forget

Reference: Sahih al-Bukhari 5039, Book of Virtues of the Qur'an. English translation by Dr. Muhammad Muhsin Khan.