A woman from the Ansar asked the Prophet ﷺ about how to perform the ritual bath after menstruation, and he instructed her how to bathe.He said, "Take a piece of cloth scented with musk and purify yourself with it."She asked, "How do I purify myself with it?"He replied, "Purify yourself with it."She asked again, "How do I purify myself with it?"He said, "Glory be to Allah! Purify yourself with it."So I drew her aside and said to her, "Follow the traces of blood with it."
إن امرأة من الأنصار سألت النبي ﷺ عن غسلها من الحيض، فأمرها كيف تغتسل، قال: خذي فرصة من مسك، فتطهري بها. قالت: كيف أتطهر بها؟ قال: تطهري بها. قالت: كيف أتطهر بها؟ قال: سبحان الله! تطهري بها. فاجتذبتها إلي، فقلت: تتبعي بها أثر الدم.
Bukhari narrated it in the Book of Menstruation (314, 315) and Muslim narrated it in the Book of Menstruation (332), both through the route of Mansur bin Safiya, from his mother Safiya, from Ayesha. He was attributed to his mother Safiya because of her fame, and she is Safiya bint Shayba bin Uthman bin Abu Talha Abdari. His father was Abdul-Rahman bin Talha bin Harith bin Talha bin Abu Talha Abdari. However, Bukhari did not mention how she performs ghusl. Muslim clarified this in the narration of Ibrahim bin Muhajir, who said, I heard Safiya narrating from Ayesha that Asma (who was the daughter of Shakal) asked the Prophet ﷺ about the ghusl for menstruation. He said, "One of you should take her water and lote-tree leaves and purify herself, purifying well, then pour water over her head and rub it vigorously until it reaches the roots of her hair, then pour water over it, then take a piece of scented cloth and purify herself with it." Asma asked, "How do I purify myself with it?" He said, "Glory be to Allah, purify yourself with it." Ayesha said (as if concealing this), "Follow the trace of the blood." She also asked him about the ghusl for janaba. He said, "She should take water and purify herself, purifying well or making the purification thorough, then pour water over her head and rub it until it reaches the roots of her hair, then pour water over the rest of her body." Ayesha said, "How excellent were the women of the Ansar. Modesty did not prevent them from gaining understanding in the religion."In another narration, Asma bint Shakal came to the Prophet ﷺ and said, "Messenger of Allah, how should one of us perform ghusl when she becomes pure from menstruation?" and the hadith continues, but it does not mention the ghusl for janaba in this version. All of these narrations are in Sahih Muslim.The "scented cloth" refers to a piece of wool or cotton. That is, after the blood stops and she performs ghusl, she takes a piece of musk, or a cloth that she scents with musk, and uses it to perfume the places where the blood was, so that its odor goes away. In a narration recorded by Abu Dawud, the word used is "qursa" with a qaf, meaning a small amount of musk taken up, like a pinch between the tips of two fingers.As for his saying "the roots of her hair," this refers to the joints and meeting points of the sections of the head, meaning that the intent is to make the water reach the roots of the hair, as a thorough measure in performing the ghusl. Ibn Athir mentioned this in Jami al-Usul (7/320-321). See the rest of the hadiths on the ghusl of the menstruating woman and the woman with istihada in the Book of Menstruation.