I never saw the Prophet (ﷺ) offering the Duha prayer but I always offer it.
Sahih al-Bukhari Book 19, Hadith 55
← Previous Hadith Only Um Hani narrated to me that she had seen the Prophet (ﷺ) offering the Duha prayer. She said, "On the day of the conquest of Mecca, the Prophet (ﷺ) entered my house, took a bath and offered eight rak`at (of Duha prayers. I had never seen the Prophet (ﷺ) offering such a light prayer but he performed bowing and prostrations perfectly .

Sahih al-Bukhari Book 19, Hadith 54 Next Hadith → My friend (the Prophet) advised me to do three things and I shall not leave them till I die, these are: To fast three days every month, to offer the Duha prayer, and to offer witr before sleeping.

Sahih al-Bukhari Book 19, Hadith 56