أَنَّ فَاطِمَةَ بِنْتَ أَبِي حُبَيْشٍ، سَأَلَتِ النَّبِيَّ صلى الله عليه وسلم قَالَتْ إِنِّي أُسْتَحَاضُ فَلاَ أَطْهُرُ، أَفَأَدَعُ الصَّلاَةَ فَقَالَ " لاَ، إِنَّ ذَلِكِ عِرْقٌ، وَلَكِنْ دَعِي الصَّلاَةَ قَدْرَ الأَيَّامِ الَّتِي كُنْتِ تَحِيضِينَ فِيهَا، ثُمَّ اغْتَسِلِي وَصَلِّي ".
Aishah reported that Fatimah bint Abi Hubaysh asked the Prophet ﷺ. She said, “I suffer from prolonged bleeding (istihadah) and do not become pure. Shall I then leave the prayer?” He said, “No, that is a vein. But leave the prayer for the …
also in Sahih al-Bukhari 228, Sahih al-Bukhari 306, Sahih al-Bukhari 320, Sahih al-Bukhari 331