The Sufficient (Vol 4) · Hadith 685 (#Ḥadīth #4)
Chapter 78 | Kinds of Masjid Where ’Ttikaf Is Valid
4ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحُسَيْنِ بْنِ سَعِيدٍ عَنْ فَضَالَةَ بْنِ أَيُّوبَ عَنْ عَبْدِ الله بْنِ سِنَانٍ قَالَ الْمُعْتَكِفُ بِمَكَّةَ يُصَلِّي فِي أَيِّ بُيُوتِهَا شَاءَ سَوَاءٌ عَلَيْهِ فِي الْمَسْجِدِ صَلَّى أَوْ فِي بُيُوتِهَا.
4. A number of our people have narrated from Ahmad ibn Muhammad from al-Husayn ibn Sa‘id from Fadalah ibn Ayyub from ‘Abd Allah ibn Sinan who has said the following: “He (the Imam) , has said, ‘One performing ’Ttikaf in Makkah can perform Salat (prayer) in any of its houses or Masjid; it is all the same.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).