Man Lā Yaḥḍuruh al-Faqīh
Hadith 4201990 - وَ رُوِيَ عَنْ سَمَاعَةَ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اَلْمُسْتَحَاضَةِ قَالَ «تَصُومُ شَهْرَ رَمَضَانَ إِلاَّ اَلْأَيَّامَ اَلَّتِي كَانَتْ تَحِيضُ فِيهِنَّ ثُمَّ تَقْضِيهَا مِنْ بَعْدِهِ».
Hadith.1990 - It was narrated from Sama'ah:
"I asked Abu Abdullah (as) about the woman experiencing istihadha (irregular bleeding).
Imam (as) said: 'She fasts during the Month of Ramadan, except for the days on which she would normally have her menstrual period. She must then make up those days afterward.'"