Sahih Muslim 334
Sahih Muslim · Book 3: The Book of Menstruation · The ghusl and the prayer of a woman who is suffering prolonged vaginal bleeding (istihadah)
'A'isha, the wife of the Apostle (ﷺ), said:
حَدَّثَنِي مُوسَى بْنُ قُرَيْشٍ التَّمِيمِيُّ ، حَدَّثَنَا إِسْحَاقُ بْنُ بَكْرِ بْنِ مُضَرَ ، حَدَّثَنِي أَبِي ، حَدَّثَنِي جَعْفَرُ بْنُ رَبِيعَةَ ، عَنْ عِرَاكِ بْنِ مَالِكٍ ، عَنْ عُرْوَةَ بْنِ الزُّبَيْرِ ، عَنْ عَائِشَةَ ، زَوْجِ النَّبِيِّ صلى الله عليه وسلم أَنَّهَا قَالَتْ إِنَّ أُمَّ حَبِيبَةَ بِنْتَ جَحْشٍ الَّتِي كَانَتْ تَحْتَ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ شَكَتْ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم الدَّمَ فَقَالَ لَهَا " امْكُثِي قَدْرَ مَا كَانَتْ تَحْبِسُكِ حَيْضَتُكِ ثُمَّ اغْتَسِلِي " . فَكَانَتْ تَغْتَسِلُ عِنْدَ كُلِّ صَلاَةٍ .
Umm Habiba b. Jahsh who was the spouse of Abd al- Rahman b. Auf made a complaint to the Messenger of Allah (ﷺ) about blood (which flows beyond the menstrual period). He said to her: Remain away (from prayer) equal (to the length of time) that your menstruation holds you back. After this, bathe yourself. And she washed herself before every prayer.