Sahih Muslim 336 e
'Abdullah b. Harith b. Naufal reported:
I had been asking about, as I was desirous to find one among people who should inform me, whether the Messenger of Allah (ﷺ) observed the forenoon prayer, but I found none to narrate that to me except Umm Hani, daughter of Abu Talib (the real sister of Hadrat 'Ali), who told me that on the day of the Conquest the Messenger of Allah (ﷺ) came (to our house) after the dawn had (sufficiently) arisen. A cloth was brought and privacy was provided for him (the Holy Prophet). He took a bath and then stood up and observed eight rak'ahs. I do not know whether his Qiyam (standing posture) was longer, or bending or prostration or all of them were of equal duration. She (Umm Hani) further said: I never saw him saying this Nafl prayer prior to it or subsequently. (Al-Muradi narrated on the authority of Yunus that he made no mention of the words:" He informed me." )
وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، وَمُحَمَّدُ بْنُ سَلَمَةَ الْمُرَادِيُّ، قَالاَ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنِي ابْنُ عَبْدِ اللَّهِ بْنِ الْحَارِثِ، أَنَّ أَبَاهُ عَبْدَ اللَّهِ بْنَ الْحَارِثِ بْنِ نَوْفَلٍ، قَالَ سَأَلْتُ وَحَرَصْتُ عَلَى أَنْ أَجِدَ أَحَدًا مِنَ النَّاسِ يُخْبِرُنِي أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم سَبَّحَ سُبْحَةَ الضُّحَى فَلَمْ أَجِدْ أَحَدًا يُحَدِّثُنِي ذَلِكَ غَيْرَ أَنَّ أُمَّ هَانِئٍ بِنْتَ أَبِي طَالِبٍ أَخْبَرَتْنِي أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم أَتَى بَعْدَ مَا ارْتَفَعَ النَّهَارُ يَوْمَ الْفَتْحِ فَأُتِيَ بِثَوْبٍ فَسُتِرَ عَلَيْهِ فَاغْتَسَلَ ثُمَّ قَامَ فَرَكَعَ ثَمَانِيَ رَكَعَاتٍ لاَ أَدْرِي أَقِيَامُهُ فِيهَا أَطْوَلُ أَمْ رُكُوعُهُ أَمْ سُجُودُهُ كُلُّ ذَلِكَ مِنْهُ مُتَقَارِبٌ - قَالَتْ - فَلَمْ أَرَهُ سَبَّحَهَا قَبْلُ وَلاَ بَعْدُ ‏.‏ قَالَ الْمُرَادِيُّ عَنْ يُونُسَ ‏.‏ وَلَمْ يَقُلْ أَخْبَرَنِي ‏.‏