Sahih Muslim 2176
صحيح مسلم#2176SahihUmm 'Atiyya reported that the Messenger of Allah (ﷺ) said to them (the women) in regard to the washing of his daughter to start from the right side and with those parts of the body over which Wudu' is performed
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 11:54