3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ سُئِلَ عَنِ الاعْتِكَافِ قَالَ لا يَصْلُحُ الاعْتِكَافُ إِلاَّ فِي الْمَسْجِدِ الْحَرَامِ أَوْ مَسْجِدِ الرَّسُولِ (صلَّى اللهُ عَلَيْهِ وَآلِه) أَوْ مَسْجِدِ الْكُوفَةِ أَوْ مَسْجِدِ جَمَاعَةٍ وَتَصُومُ مَا دُمْتَ مُعْتَكِفاً.
3. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hammad from al-Halabiy who has said the following: “Once abu ‘Abd Allah (a.s.), was asked about ’Ttikaf. He (the Imam) said, ‘Without Masjid ’Ttikaf is not valid, only in Masjid like Masjid al-Haram, Masjid of the Messenger of Allah, Masjid al-Kufah or Masjid al-Jami‘ and you must fast in the time you are in the state of ’Ttikaf.’”