Chapter on I'tikaf (spiritual Retreat)
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 38
وَ رَوَى اَلْحَسَنُ بْنُ مَحْبُوبٍ عَنْ أَبِي وَلاَّدٍ اَلْحَنَّاطِ قَالَ: سَأَلْتُ أَبَا عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ عَنِ اِمْرَأَةٍ كَانَ زَوْجُهَا غَائِباً فَقَدِمَ وَ هِيَ مُعْتَكِفَةٌ بِإِذْنِ زَوْجِهَا فَخَرَجَتْ حِينَ بَلَغَهَا قُدُومُهُ مِنَ اَلْمَسْجِدِ اَلَّذِي هِيَ فِيهِ فَتَهَيَّأَتْ لِزَوْجِهَا حَتَّى وَاقَعَهَا فَقَالَ إِنْ كَانَتْ خَرَجَتْ مِنَ اَلْمَسْجِدِ قَبْلَ أَنْ تَمْضِيَ ثَلاَثَةُ أَيَّامٍ وَ لَمْ تَكُنِ اِشْتَرَطَتْ فِي اِعْتِكَافِهَا فَإِنَّ عَلَيْهَا مَا عَلَى اَلْمُظَاهِرِ.
It is narrated by Al-Hasan ibn Mahbub, from Abu Walad Al-Hannat, who said: "I asked Abu Abdullah عليه السلام about a woman whose husband was absent. While she was performing i'tikaf with her husband's permission, he returned, and upon hearing of his arrival, she left the mosque where she was performing i'tikaf, prepared herself for him, and engaged in intimacy with him. Imam عليه السلام said: 'If she left the mosque before completing three days and had not stipulated any conditions for her i'tikaf, then she incurs the same penalty as that of one who has taken a vow of zihar (penalty for breaking a serious vow).'"
- Ṣaḥīḥ al-Faqīh, p. 111