قُلْتُ لِأَبِي عَبْدِ اللَّهِ ع مَا تَقُولُ فِي الِاعْتِكَافِ بِبَغْدَادَ فِي بَعْضِ مَسَاجِدِهَا فَقَالَ لَا اعْتِكَافَ إِلَّا فِي مَسْجِدِ جَمَاعَةٍ قَدْ صَلَّى فِيهِ إِمَامٌ عَدْلٌ بِصَلَاةِ جَمَاعَةٍ وَ لَا بَأْسَ أَنْ يُعْتَكَفَ فِي مَسْجِدِ الْكُوفَةِ وَ الْبَصْرَةِ وَ مَسْجِدِ الْمَدِينَةِ وَ مَسْجِدِ مَكَّةَ.
“I once asked abu ‘Abd Allah (a.s.), about performing Ttikaf in a certain Masjid of Baghdad. He (the Imam) said, ’Without a Masjid in which Salat (prayer) in congregation is held behind a just Imam, Ttikaf is not valid. It is not harmful to do Ttikaf in Masjid of al-Kufah, in al- Basrah, in al-Madinah or Makkah.’”