(50) باب مَنْزِلُ النَّبِيِّ صلى الله عليه وسلم يَوْمَ الْفَتْحِ
Narrated Ibn Abi Laila:
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 rak`at prayer. She added, "I never saw the Prophet (ﷺ) offering a lighter prayer than that prayer, but he was performing perfect bowing and prostrations."
Reference: Sahih al-Bukhari 4292
In-book reference: Book 64, Hadith 325
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 59, Hadith 587