Bahiyyah said: I heard a woman asking Aisha about the woman whose menses became abnormal and she had an issue of blood. The Messenger of Allah ﷺ asked me to advise her that she should consider the period during which she used to menstruate every month, when her menstruation was normal. Then she should count the days equal to the length of time (of her normal menses); then she should abandon prayer during those days or equal to that period. She should then take a bath, tie a cloth on her private parts a pray.  

عَنِ امْرَأَةٍ فَسَدَ حَيْضُهَا وَأُهَرِيقَتْ دَمًا فَأَمَرَنِي رَسُولُ اللَّهِ ﷺ أَنْ آمُرَهَا فَلْتَنْظُرْ قَدْرَ مَا كَانَتْ تَحِيضُ فِي كُلِّ شَهْرٍ وَحَيْضُهَا مُسْتَقِيمٌ فَلْتَعْتَدَّ بِقَدْرِ ذَلِكَ مِنَ الأَيَّامِ ثُمَّ لْتَدَعِ الصَّلاَةَ فِيهِنَّ أَوْ بِقَدْرِهِنَّ ثُمَّ لْتَغْتَسِلْ ثُمَّ لْتَسْتَثْفِرْ بِثَوْبٍ ثُمَّ لْتُصَلِّي  

Yahya related to me from Malik from Nafi from Sulayman ibn Yasarfrom Umm Salama, the wife of the Prophet ﷺ that a certain woman in the time of the Messenger of Allah ﷺ used to bleed profusely, so Umm Salama consulted the Messenger of Allah ﷺ for her, and he said, "She should calculate the number of nights and days a month that she used to menstruate before it started happening, and she should leave off from prayerfor that much of the month. When she has completed that she should do ghusl, bind her private parts with a cloth, and then pray."  

عَنْ أُمِّ سَلَمَةَ زَوْجِ النَّبِيِّ ﷺ أَنَّ امْرَأَةً كَانَتْ تُهَرَاقُ الدِّمَاءَ فِي عَهْدِ رَسُولِ اللَّهِ ﷺ فَاسْتَفْتَتْ لَهَا أُمُّ سَلَمَةَ رَسُولَ اللَّهِ ﷺ فَقَالَ لِتَنْظُرْ إِلَى عَدَدِ اللَّيَالِي وَالأَيَّامِ الَّتِي كَانَتْ تَحِيضُهُنَّ مِنَ الشَّهْرِ قَبْلَ أَنْ يُصِيبَهَا الَّذِي أَصَابَهَا فَلْتَتْرُكِ الصَّلاَةَ قَدْرَ ذَلِكَ مِنَ الشَّهْرِ فَإِذَا خَلَّفَتْ ذَلِكَ فَلْتَغْتَسِلْ ثُمَّ لِتَسْتَثْفِرْ بِثَوْبٍ ثُمَّ لِتُصَلِّي  

[Machine] Aisha said, "I asked the Messenger of Allah ﷺ about a woman whose menstruation becomes irregular and she experiences unexpected bleeding, and she doesn't know how to pray. The Messenger of Allah ﷺ commanded me to tell her to estimate the duration of her normal menstrual cycle every month, and when her period comes, she should count the days and nights, then she should stop praying for that period of time. After that, she should perform ghusl (ritual purification) and ensure cleanliness, then seek forgiveness with a cloth, and then she can pray. I hope that this is from Shaytan and that Allah will remove it from her if He wills." Aisha continued, "I commanded her to do so, and she did it, and Allah removed it from her. So, inform your companion about this, using the words of the hadith of Ibrahim bin Ali."  

لَهَا عَائِشَةُ سَأَلْتُ رَسُولَ اللهِ ﷺ لِامْرَأَةٍ فَسَدَ حَيْضَتُهَا وَأُهْرِيقَتْ دَمًا لَا تَدْرِي كَيْفَ تُصَلِّي؟ قَالَتْ فَأَمَرَنِي رَسُولُ اللهِ ﷺ أَنْ آمُرَهَا فَلْتَنْظُرْ قَدْرَ مَا كَانَتْ تَحِيضُ فِي كُلِّ شَهْرٍ وَحَيْضُهَا مُسْتَقِيمٌ فَلْتَعْتَدَّ وَفِي حَدِيثِ إِسْمَاعِيلَ فَلْتَقْعُدْ وَتُقَدِّرْ ذَلِكَ مِنَ الْأَيَّامِ وَاللَّيَالِي ثُمَّ لِتَدَعِ الصَّلَاةَ فِيهِنَّ بِقَدْرِهِنَّ ثُمَّ لِتَغْتَسِلْ وَلْتَحْسُنْ طُهْرَهَا ثُمَّ تَسْتَدْفِرْ بِثَوْبٍ ثُمَّ تُصَلِّي فَإِنِّي أَرْجُو أَنْ يَكُونَ هَذَا مِنَ الشَّيْطَانِ وَأَنْ يُذْهِبَهُ اللهُ تَعَالَى عَنْهَا إِنْ شَاءَ اللهُ تَعَالَى قَالَتْ فَأَمَرْتُهَا فَفَعَلَتْ فَأَذْهَبَهَا اللهُ عَنْهَا فَمُرِي صَاحِبَتَكِ بِذَلِكَ لَفْظُ حَدِيثِ إِبْرَاهِيمَ بْنِ عَلِيٍّ