Sunan an-Nasa'i 226
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.
أَخْبَرَنَا يَعْقُوبُ بْنُ إِبْرَاهِيمَ، عَنْ عَبْدِ الرَّحْمَنِ، عَنْ مَالِكٍ، عَنْ سَالِمٍ، عَنْ أَبِي مُرَّةَ، مَوْلَى عَقِيلِ بْنِ أَبِي طَالِبٍ عَنْ أُمِّ هَانِئٍ، رضى الله عنها أَنَّهَا ذَهَبَتْ إِلَى النَّبِيِّ ﷺ يَوْمَ الْفَتْحِ فَوَجَدَتْهُ يَغْتَسِلُ وَفَاطِمَةُ تَسْتُرُهُ بِثَوْبٍ فَسَلَّمَتْ فَقَالَ " مَنْ هَذَا " . قُلْتُ أُمُّ هَانِئٍ . فَلَمَّا فَرَغَ مِنْ غُسْلِهِ قَامَ فَصَلَّى ثَمَانِيَ رَكَعَاتٍ فِي ثَوْبٍ مُلْتَحِفًا بِهِ .