Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ رَوَى مُحَمَّدُ بْنُ سَهْلٍ عَنِ اَلرِّضَا عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «اَلْإِمَامُ يَحْمِلُ أَوْهَامَ مَنْ خَلْفَهُ إِلاَّ تَكْبِيرَةَ اَلاِفْتِتَاحِ.
Muhammad ibn Sahl narrated from Imam Al-Ridha عليه السلام that He said: "The Imam bears the mistakes (or forgetfulness) of those who pray behind him, except for the opening takbir (takbirat al-ihram)."
- Ṣaḥīḥ al-Faqīh