Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ رَوَى سَعْدُ بْنُ إِسْمَاعِيلَ عَنْ أَبِيهِ عَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: سَأَلْتُهُ عَنِ اَلرَّجُلِ يُقَارِفُ اَلذَّنْبَ يُصَلَّى خَلْفَهُ أَمْ لاَ قَالَ «لاَ.
Saʿd ibn Ismail narrated from his father, who narrated from al-Ridha عليه السلام, that He said: "I asked him about a man who commits sins ; should one pray behind him or not?" Imam عليه السلام said: "No."
- Ṣaḥīḥ al-Faqīh, p. 53