Chapter on I'tikaf (spiritual Retreat)
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 38
وَ فِي رِوَايَةِ عَبْدِ اَللَّهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: «اَلْمُعْتَكِفُ بِمَكَّةَ يُصَلِّي فِي أَيِّ بُيُوتِهَا شَاءَ سَوَاءٌ عَلَيْهِ صَلَّى فِي اَلْمَسْجِدِ أَوْ فِي بُيُوتِهَا».
In a narration from Abdullah ibn Sinan, from Abu Abdullah عليه السلام, it is reported: "The one performing i'tikaf in Mecca may pray in any of its houses; it is the same whether they pray in the mosque or in its houses."
- Ṣaḥīḥ al-Faqīh, p. 111