Sahih Bukhari Volume 2, Book 23, Hadith 1257

حَدَّثَنَا يَحْيَى بْنُ مُوسَى، حَدَّثَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ خَالِدٍ الْحَذَّاءِ، عَنْ حَفْصَةَ بِنْتِ سِيرِينَ، عَنْ أُمِّ عَطِيَّةَ ـ رضى الله عنها ـ قَالَتْ لَمَّا غَسَّلْنَا بِنْتَ النَّبِيِّ صلى الله عليه وسلم قَالَ لَنَا وَنَحْنُ نَغْسِلُهَا ‏"‏ ابْدَأْنَ بِمَيَامِنِهَا وَمَوَاضِعِ الْوُضُوءِ ‏"‏‏

Narrated By Um 'Atiyya : When we washed the deceased daughter of the Prophet, he said to us, while we were washing her, "Start the bath from the right side and from the parts which are washed in ablution."