Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ سَأَلَ جَمِيلُ بْنُ صَالِحٍ: أَيُّهُمَا أَفْضَلُ يُصَلِّي اَلرَّجُلُ لِنَفْسِهِ فِي أَوَّلِ اَلْوَقْتِ أَوْ يُؤَخِّرُ قَلِيلاً وَ يُصَلِّي بِأَهْلِ مَسْجِدِهِ إِذَا كَانَ إِمَامَهُمْ قَالَ «يُؤَخِّرُ وَ يُصَلِّي بِأَهْلِ مَسْجِدِهِ إِذَا كَانَ هُوَ اَلْإِمَامَ.
Jamil ibn Salih asked: "Which is better, for a man to pray by himself at the beginning of the time (for prayer) or to delay a little and pray with the people of his mosque if he is their Imam?" He عليه السلام replied: "He should delay and pray with the people of his mosque if he is their Imam."
- Ṣaḥīḥ al-Faqīh