Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «مَنْ صَلَّى بِقَوْمٍ وَ فِيهِمْ مَنْ هُوَ أَعْلَمُ مِنْهُ لَمْ يَزَلْ أَمْرُهُمْ إِلَى سَفَالٍ إِلَى يَوْمِ اَلْقِيَامَةِ.
The Messenger of Allah صلى الله عليه وعلى آله وسلم said: "Whoever leads a people in prayer while there is someone among them who is more knowledgeable than him, their affairs will continue to decline until the Day of Judgment."
- Ṣaḥīḥ al-Faqīh