It was narrated from Umm Hani' that she went to the Prophet (ﷺ) on the day of the Conquest (of Makkah) and found him performing Ghusl while Fatimah was concealing him with a garment. She gave him Salams and he said:
"Who is this?" She said: "Umm Hani'." When he had finished his Ghusl he stood up and prayed eight Rak'ahs wrapped in a garment.
English reference: Vol. 1, Book 1, Hadith 226
Arabic reference: Book 1, Hadith 227