Sahih Muslim Book - 6, Hadith - 1668

وَحَدَّثَنِى حَرْمَلَةُ بْنُ يَحْيَى وَمُحَمَّدُ بْنُ سَلَمَةَ الْمُرَادِىُّ قَالاَ أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ أَخْبَرَنِى يُونُسُ عَنِ ابْنِ شِهَابٍ قَالَ حَدَّثَنِى ابْنُ عَبْدِ اللَّهِ بْنِ الْحَارِثِ أَنَّ أَبَاهُ عَبْدَ اللَّهِ بْنَ الْحَارِثِ بْنِ نَوْفَلٍ قَالَ سَأَلْتُ وَحَرَصْتُ عَلَى أَنْ أَجِدَ أَحَدًا مِنَ النَّاسِ يُخْبِرُنِى أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- سَبَّحَ سُبْحَةَ الضُّحَى فَلَمْ أَجِدْ أَحَدًا يُحَدِّثُنِى ذَلِكَ غَيْرَ أَنَّ أُمَّ هَانِئٍ بِنْتَ أَبِى طَالِبٍ أَخْبَرَتْنِى أَنَّ رَسُولَ اللَّهِ -صلى الله عليه وسلم- أَتَى بَعْدَ مَا ارْتَفَعَ النَّهَارُ يَوْمَ الْفَتْحِ فَأُتِىَ بِثَوْبٍ فَسُتِرَ عَلَيْهِ فَاغْتَسَلَ ثُمَّ قَامَ فَرَكَعَ ثَمَانِىَ رَكَعَاتٍ لاَ أَدْرِى أَقِيَامُهُ فِيهَا أَطْوَلُ أَمْ رُكُوعُهُ أَمْ سُجُودُهُ كُلُّ ذَلِكَ مِنْهُ مُتَقَارِبٌ - قَالَتْ - فَلَمْ أَرَهُ سَبَّحَهَا قَبْلُ وَلاَ بَعْدُ. قَالَ الْمُرَادِىُّ عَنْ يُونُسَ. وَلَمْ يَقُلْ أَخْبَرَنِى.

It was narrated that Ibn Shihab said: "Ibn 'Abdullah bin Al-Harith told me that his father, 'Abdullah bin Al-Harith bin Nawfal, said: 'I asked, and I was keen, to find someone who could tell me that the Messenger of Allah (s.a.w) had prayed Duha. But I could not find anyone who could tell me that except Umm Hani' bint Abi Talib. She told me that after the day had grown bright on the day of the Conquest (of Makkah), the Messenger of Allah (s.a.w) came, and a cloth was brought to form a screen, and he performed Ghusl. Then he stood and prayed eight Rak'ah, and I do not know whether the standing was longer, or the bowing, or prostration; they were all similar in length. And I did not see him offer that prayer before or after."