Sahih al-Bukhari 1256
صحيح البخاري#1256SahihNarrated 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 23:18