Chapter on I'tikaf (spiritual Retreat)
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 38
وَ رَوَى اِبْنُ مَحْبُوبٍ عَنْ أَبِي أَيُّوبَ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: فِي اَلْمُعْتَكِفَةِ إِذَا طَمِثَتْ قَالَ «تَرْجِعُ إِلَى بَيْتِهَا فَإِذَا طَهُرَتْ رَجَعَتْ فَقَضَتْ مَا عَلَيْهَا ».
It is narrated by Ibn Mahbub, from Abu Ayyub, from Abu Basir, from Abu Abdullah عليه السلام, regarding a woman performing i'tikaf who experiences menstruation. Imam عليه السلام said: "She should return to her home, and when she becomes pure, she should return and make up for what she missed."
- Ṣaḥīḥ al-Faqīh, p. 113