(12) باب مَنْ تَطَوَّعَ فِي السَّفَرِ فِي غَيْرِ دُبُرِ الصَّلَوَاتِ وَقَبْلَهَا
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 (ﷺ) 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.
Reference: Sahih al-Bukhari 1103
In-book reference: Book 18, Hadith 23
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 20, Hadith 207