Sahih Muslim , Hadith 812 ⓘ
It is reported on the authority of Abu Huraira that the Messenger of Allah said: Get together. for I am going to recite one-third of the Qur'an before you. And those who could get together gathered there. Then the Messenger of Allah came out and recited:" Say: He, Allah, is One." He then entered (his house). Some of us said to the others: Perhaps there has been some news from the heaven on account of which he has gone Inside (the house). The Apostle of Allah again came out and said: I told you that I was going to recite one-third of the Qur'in; keep in mind, this (Surah Ikhlas) is equivalent to one-third of the Qur'an.
وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، وَيَعْقُوبُ بْنُ إِبْرَاهِيمَ، جَمِيعًا عَنْ يَحْيَى، - قَالَ ابْنُ حَاتِمٍ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، - حَدَّثَنَا يَزِيدُ بْنُ كَيْسَانَ، حَدَّثَنَا أَبُو حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " احْشِدُوا فَإِنِّي سَأَقْرَأُ عَلَيْكُمْ ثُلُثَ الْقُرْآنِ " . فَحَشَدَ مَنْ حَشَدَ ثُمَّ خَرَجَ نَبِيُّ اللَّهِ صلى الله عليه وسلم فَقَرَأَ { قُلْ هُوَ اللَّهُ أَحَدٌ} ثُمَّ دَخَلَ فَقَالَ بَعْضُنَا لِبَعْضٍ إِنِّي أُرَى هَذَا خَبَرٌ جَاءَهُ مِنَ السَّمَاءِ فَذَاكَ الَّذِي أَدْخَلَهُ . ثُمَّ خَرَجَ نَبِيُّ اللَّهِ صلى الله عليه وسلم فَقَالَ " إِنِّي قُلْتُ لَكُمْ سَأَقْرَأُ عَلَيْكُمْ ثُلُثَ الْقُرْآنِ أَلاَ إِنَّهَا تَعْدِلُ ثُلُثَ الْقُرْآنِ " .
also referenced under: Book 6, Hadith 316 (In-Book) & Book 4, Hadith 1771 (USC-MSA)
Abu Huraira reported: The Messenger of Allah came out to us and said: I am going to recite before you one-third of the Qur'an. He (the Holy Prophet) then recited:" Say: He is Allah, One--Allah, the Eternal," to the end of the Surah.
وَحَدَّثَنَا وَاصِلُ بْنُ عَبْدِ الأَعْلَى، حَدَّثَنَا ابْنُ فُضَيْلٍ، عَنْ بَشِيرٍ أَبِي إِسْمَاعِيلَ، عَنْ أَبِي حَازِمٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ خَرَجَ إِلَيْنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ " أَقْرَأُ عَلَيْكُمْ ثُلُثَ الْقُرْآنِ " . فَقَرَأَ { قُلْ هُوَ اللَّهُ أَحَدٌ * اللَّهُ الصَّمَدُ} حَتَّى خَتَمَهَا .
also referenced under: Book 6, Hadith 317 (In-Book) & Book 4, Hadith 1772 (USC-MSA)