Sahih al Bukhari 1257
Funerals (Al-Janaa'iz)
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 Um 'Atiyya:The daughter of the Prophet (ﷺ) 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
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.