Abdullah bin al-Harith bin Nawfal (may Allah have mercy on him) said: In the time of Uthman bin Affan (may Allah be pleased with him), I asked about the Duha (forenoon) prayer: did the Messenger of Allah (peace and blessings be upon him) pray it? I found no one who claimed to have seen him (peace and blessings be upon him) do so except Umm Hani (may Allah be pleased with her). She reported that: "The Messenger of Allah (peace and blessings be upon him) came to Fatimah (may Allah be pleased with her) on the day of the Conquest of Makkah, which was a Friday, while Umm Hani was with her. He (peace and blessings be upon him) poured water over himself, then he (peace and blessings be upon him) prayed eight rak'ahs. We never saw him (peace and blessings be upon him) pray it before that, nor after."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21397