Sahih al-Bukhari, Volume 2, Book 20, Hadith 207 (USC-MSA) ⓘ

Narrated Ibn Abu Laila: Only Um Hani told us that she had seen the Prophet (p.b.u.h) offering the Duha (forenoon prayer). She said, "On the day of the conquest of Mecca, the Prophet took a bath in my house and offered eight rak`at. I never saw him praying such a light prayer but he performed perfect prostration and bowing.

حَدَّثَنَا حَفْصُ بْنُ عُمَرَ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرٍو، عَنِ ابْنِ أَبِي لَيْلَى، قَالَ مَا أَنْبَأَ أَحَدٌ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم صَلَّى الضُّحَى غَيْرُ أُمِّ هَانِئٍ ذَكَرَتْ أَنَّ النَّبِيَّ صلى الله عليه وسلم يَوْمَ فَتْحِ مَكَّةَ اغْتَسَلَ فِي بَيْتِهَا، فَصَلَّى ثَمَانِ رَكَعَاتٍ، فَمَا رَأَيْتُهُ صَلَّى صَلاَةً أَخَفَّ مِنْهَا، غَيْرَ أَنَّهُ يُتِمُّ الرُّكُوعَ وَالسُّجُودَ‏.‏

Narrated `Abdullah bin Amir that his father had told him that he had seen the Prophet (p.b.u.h) praying Nawafil at night on the back of his Mount on a journey, facing whatever direction it took.

وَقَالَ اللَّيْثُ حَدَّثَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ عَامِرٍ، أَنَّ أَبَاهُ، أَخْبَرَهُ أَنَّهُ، رَأَى النَّبِيَّ صلى الله عليه وسلم صَلَّى السُّبْحَةَ بِاللَّيْلِ فِي السَّفَرِ عَلَى ظَهْرِ رَاحِلَتِهِ حَيْثُ تَوَجَّهَتْ بِهِ‏.‏