Sahih Bukhari Volume 2, Book 23, Hadith 1258

حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ حَمَّادٍ، أَخْبَرَنَا ابْنُ عَوْنٍ، عَنْ مُحَمَّدٍ، عَنْ أُمِّ عَطِيَّةَ، قَالَتْ تُوُفِّيَتْ بِنْتُ النَّبِيِّ صلى الله عليه وسلم فَقَالَ لَنَا ‏"‏ اغْسِلْنَهَا ثَلاَثًا أَوْ خَمْسًا أَوْ أَكْثَرَ مِنْ ذَلِكَ إِنْ رَأَيْتُنَّ، فَإِذَا فَرَغْتُنَّ فَآذِنَّنِي ‏"‏‏.‏ فَلَمَّا فَرَغْنَا آذَنَّاهُ فَنَزَعَ مِنْ حِقْوِهِ إِزَارَهُ وَقَالَ ‏"‏ أَشْعِرْنَهَا إِيَّاهُ ‏"‏‏

Narrated By Um 'Atiyya : The daughter of the Prophet expired, and he said to us, "Wash her three or five times, or more if you see it necessary, and when you finish, notify me." So, (when we finished) we informed him and he unfastened his waist-sheet and told us to shroud her in it.