Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ رَوَى اَلْحَسَنُ بْنُ مَحْبُوبٍ عَنْ جَمِيلِ بْنِ صَالِحٍ عَنْ سَمَاعَةَ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ: فِي رَجُلٍ سَبَقَهُ اَلْإِمَامُ بِرَكْعَةٍ ثُمَّ أَوْهَمَ اَلْإِمَامُ فَصَلَّى خَمْساً قَالَ «يَقْضِي تِلْكَ اَلرَّكْعَةَ وَ لاَ يَعْتَدُّ بِوَهَمِ اَلْإِمَامِ.
Al-Hasan ibn Mahbub narrated from Jamil ibn Salih, from Sama’a, from Imam Jafar ibn Muhammad Al-Sadiq عليه السلام regarding a man who was behind the Imam and missed one rak'ah, but then the Imam mistakenly performed five rak'ahs. Imam عليه السلام said: "He (the follower) should make up the missed rak'ah and should not count the Imam's mistake”.
- Ṣaḥīḥ al-Faqīh