None informed us that he saw the Prophet ﷺ offering the Duha (i.e. forenoon) prayer, except Um Hani who mentioned that the Prophet ﷺ took a bath in her house on the day of the Conquest (of Mecca) and then offered an eight rakʿat prayer. She added, "I never saw the Prophet ﷺ offering a lighter prayer than that prayer, but he was performing perfect bowing and prostrations." (Using translation from Bukhārī 4292)  

أَنَّهُ رَأَى النَّبِيَّ ﷺ يُصَلِّي الضُّحَى غَيْرُ أُمِّ هَانِئٍ فَإِنَّهَا ذَكَرَتْ أَنَّهُ «يَوْمَ فَتْحِ مَكَّةَ اغْتَسَلَ فِي بَيْتِهَا ثُمَّ صَلَّى ثَمَانَ رَكَعَاتٍ» قَالَتْ وَلَمْ أَرَهُ صَلَّى صَلَاةً أَخَفَّ مِنْهَا غَيْرَ أَنَّهُ يُتِمُّ الرُّكُوعَ وَالسُّجُودَ  

[Machine] He informed him that he heard Umm Haneen, the daughter of Abu Talib, saying that she went to the Messenger of Allah ﷺ in the year of the conquest and found him performing ablution, and his daughter Fatimah covered him with a garment. Umm Haneen said, "I greeted him and it was in the morning." The Messenger of Allah ﷺ said, "Who is this?" I said, "I am Umm Haneen." When he finished his ablution, he stood up and prayed eight rak'ahs, wrapped in one garment, then he departed. I said, "O Messenger of Allah, my son claims that he killed a man who you had hired, Fulan bin Hubayrah." The Messenger of Allah ﷺ said, "We have indeed rewarded those whom you have rewarded, O Umm Haneen."  

أَخْبَرَهُ أَنَّهُ سَمِعَ أُمَّ هَانِئٍ بِنْتَ أَبِي طَالِبٍ تُحَدِّثُ أَنَّهَا ذَهَبَتْ إِلَى رَسُولِ اللَّهِ ﷺ عَامَ الْفَتْحِ فَوَجَدَتْهُ يَغْتَسِلُ وَفَاطِمَةُ بِنْتُهُ تَسْتُرُهُ بِثَوْبٍ قَالَتْ فَسَلَّمْتُ عَلَيْهِ وَذَلِكَ ضُحًى قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ هَذِهِ؟» فَقُلْتُ أَنَا أُمُّ هَانِئٍ قَالَتْ فَلَمَّا فَرَغَ مِنْ غُسْلِهِ قَامَ فَصَلَّى ثَمَانَ رَكَعَاتٍ مُلْتَحِفًا فِي ثَوْبٍ وَاحِدٍ ثُمَّ انْصَرَفَ فَقُلْتُ يَا رَسُولَ اللَّهِ زَعَمَ ابْنُ أُمِّي أَنَّهُ قَاتِلٌ رَجُلًا أَجَرْتُهُ فُلَانَ بْنَ هُبَيْرَةَ فَقَالَ رَسُولُ اللَّهِ ﷺ «قَدْ أَجَرْنَا مَنْ أَجَرْتِ يَا أُمَّ هَانِئٍ»  

[Machine] My friend advised me of three things that I will not abandon until I die: praying the Witr prayer before I sleep, fasting three days every month, and performing two units of prayer before the Dhuha prayer.  

أَوْصَانِي خَلِيلِي بِثَلَاثٍ لَا أَدَعُهُنَّ حَتَّى أَمُوتَ الْوِتْرِ قَبْلَ أَنْ أَنَامَ وَصَوْمِ ثَلَاثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَمِنَ الضُّحَى رَكْعَتَيْنِ