Al-Kāfi - The Book of Prayer

Chapter: Excellence of Salah (prayer) in Congregation َّدٍ عَنْ سَهْلِ بْنِ زِيَادٍ بِإِسْنَادِهِ قَالَ قَالَ فَضْلُ ٠ِنِ الصُّفُوفِ عَلَى ٠َيَاسِرِهَا كَفَضْلِ الْجَ٠َاعَةِ عَلَى صَلاَةِ الْفَرْدِ. 8.

Ali ibn Muhammad has narrated from Sahl ibn Ziyad through the same chain of his narrators has said following: “He (the Imam) has said, ‘The excellence of performing Salah (prayer) in the center of the rows over that in the left is like the excellence of performing Salah (prayer) in congregation over performing Salah (prayer) alone individually.’” شهور - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/254))