Abu Sa’id al-Khudri reported: The Prophet, peace and blessings be upon him, said to his companions, “Is it difficult for one of you to recite a third of the Quran in a single night?” That was difficult for them, so they said, “Which one of us can do that, O Messenger of Allah?” The Prophet said, “The chapter, ‘Allah, the One, the Refuge’ (112:1) is worth one-third of the Quran.”
Source: Ṣaḥīḥ al-Bukhārī 4727
Grade: Sahih (authentic) according to Al-Bukhari
عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِأَصْحَابِهِ أَيَعْجِزُ أَحَدُكُمْ أَنْ يَقْرَأَ ثُلُثَ الْقُرْآنِ فِي لَيْلَةٍ فَشَقَّ ذَلِكَ عَلَيْهِمْ وَقَالُوا أَيُّنَا يُطِيقُ ذَلِكَ يَا رَسُولَ اللَّهِ فَقَالَ اللَّهُ الْوَاحِدُ الصَّمَدُ ثُلُثُ الْقُرْآنِ
4727 صحيح البخاري كتاب فضائل القرآن باب فضل قل هو الله أحد