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 فَاخْتَصَّ نَفْسَهُ بِالدُّعَاءِ دُونَهُمْ فَقَدْ خَانَهُمْ.
The Messenger of Allah صلى الله عليه وعلى آله وسلم said: "Whoever leads a group in prayer and reserves the supplication for himself, excluding them, has betrayed them”.
- Ṣaḥīḥ al-Faqīh