Hadithcore
Sahih al-Bukhari, 5015
sahih

Narrated Abu Sa`id Al-Khudri:

The Prophet (ﷺ) said to his companions, "Is it difficult for any of you to recite one third of the Qur'an in one night?" This suggestion was difficult for them so they said, "Who among us has the power to do so, O Allah's Messenger (ﷺ) ?" Allah Messenger replied: " Allah (the) One, the Self-Sufficient Master Whom all creatures need.' (Surat Al-Ikhlas 112:1--to the End) is equal to one third of the Qur'an."

حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، حَدَّثَنَا إِبْرَاهِيمُ، وَالضَّحَّاكُ الْمَشْرِقِيُّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، رضى الله عنه قَالَ قَالَ النَّبِيُّ صلى الله عليه وسلم لأَصْحَابِهِ ‏"‏ أَيَعْجِزُ أَحَدُكُمْ أَنْ يَقْرَأَ ثُلُثَ الْقُرْآنِ فِي لَيْلَةٍ ‏"‏‏.‏ فَشَقَّ ذَلِكَ عَلَيْهِمْ وَقَالُوا أَيُّنَا يُطِيقُ ذَلِكَ يَا رَسُولَ اللَّهِ فَقَالَ ‏"‏ اللَّهُ الْوَاحِدُ الصَّمَدُ ثُلُثُ الْقُرْآنِ ‏"‏‏.‏ قَالَ أَبُو عَبْدِ اللَّهِ عَنْ إِبْرَاهِيمَ مُرْسَلٌ وَعَنِ الضَّحَّاكِ الْمَشْرِقِيِّ مُسْنَدٌ‏.‏

References2 variants
In-Book Reference
Book 66, Hadith 37
USC-MSA web (English) reference
Vol. 6, Book 61, Hadith 534 (deprecated numbering scheme)
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