Narrated Ibn Laila:

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

حَدَّثَنِي مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا غُنْدَرٌ، حَدَّثَنَا شُعْبَةُ، عَنْ مَنْصُورٍ، عَنْ أَبِي الضُّحَى، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ كَانَ النَّبِيُّ ﷺ يَقُولُ فِي رُكُوعِهِ وَسُجُودِهِ
" سُبْحَانَكَ اللَّهُمَّ، رَبَّنَا وَبِحَمْدِكَ، اللَّهُمَّ اغْفِرْ لِي ".