Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

Tahdhīb al-Aḥkām|Volume 3|Book 1|Chapter 3

Tahdhīb al-Aḥkām

Volume 3, Book 1, Chapter 3

Chapter on the Rulings of Congregational Prayer (the Minimum Number for Congregational Prayer, the Description of the Imam, Who Is to Be Followed and Who Is Not to Be Followed, Recitation Behind Both of Them, the Rulings of Those Led in Prayer, and Other Such Rulings Related to It)

Hadith #21

وَ عَنْهُ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنِ اَلْحَسَنِ بْنِ عَلِيِّ بْنِ يَقْطِينٍ عَنْ عَمْرِو بْنِ إِبْرَاهِيمَ عَنْ خَلَفِ بْنِ حَمَّادٍ عَنْ رَجُلٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ:« لاَ تُصَلِّ خَلْفَ اَلْغَالِي وَ إِنْ كَانَ يَقُولُ بِقَوْلِكَ وَ اَلْمَجْهُولِ وَ اَلْمُجَاهِرِ بِالْفِسْقِ وَ إِنْ كَانَ مُقْتَصِداً»

And from him, from Muhammad ibn Isa from al-Hasan ibn Ali ibn Yaqtin from Amru ibn Ibrahim from Khalaf ibn Hammad from a man from Abi Abdillah , peace be upon him, who said: Imam al-Sadiq said: “Do not pray behind the extremist (al-ghali), even if he claims your belief; nor behind the unknown (al-majhul); nor behind one who openly commits immorality (al-mujahir bil-fisq), even if he is moderate.”

Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 3, p. 34