Sahih Muslim 744
صحيح مسلم#744SahihUmm Salama reported:I said: Messenger of Allah, I am a woman who has closely plaited hair on my head; should I undo it for taking a bath, because of sexual intercourse? He (the Holy Prophet) said: No, it is enough for you to throw three handfuls of water on your head and then pour water over yourself, and you shall be purified
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: 3:66