Ash-Shama'il Al-Muhammadiyah, Book 40, Hadith 274 (English) ⓘ

'Abdurrahmaan bin Abi Layla RA. (a Taabi'ee) reports: "None had given me the news that they had observed Rasulullah Sallallahu 'Alayhi Wasallam perform the salaatut duhah besides Ummi Haani. She said: Rasulullah Sallallahu 'Alayhi Wasallam came to her house, the day Makkah was conquered. He performed ghusl (bath), then performed eight rak'ahs. I did not observe Rasulullah Sallallahu 'Alayhi Wasallam perform any salaah shorter than these, despite him performing every ruku' and sajdah properly"'. (He did not perform the ruku' and saidah haphazardly because the salaah was short).

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ‏:‏ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ‏:‏ حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، قَالَ‏:‏ مَا أَخْبَرَنِي أَحَدٌ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم يُصَلِّي الضُّحَى إِلا أُمُّ هَانِئٍ، فَإِنَّهَا حَدَّثَتْ أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم، دَخَلَ بَيْتَهَا يَوْمَ فَتْحِ مَكَّةَ فَاغْتَسَلَ فَسَبَّحَ ثَمَانِيَ رَكَعَاتٍ مَا رَأَيْتُهُ صلى الله عليه وسلم، صَلَّى صَلاةً قَطُّ أَخَفَّ مِنْهَا، غَيْرَ أَنَّهُ كَانَ يُتِمُّ الرُّكُوعَ وَالسُّجُودَ‏.‏