Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ رَوَى زُرَارَةُ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «يَنْبَغِي لِلصُّفُوفِ أَنْ تَكُونَ تَامَّةً مُتَوَاصِلَةً بَعْضُهَا إِلَى بَعْضٍ وَ لاَ يَكُونَ بَيْنَ اَلصَّفَّيْنِ مَا لاَ يُتَخَطَّى يَكُونُ قَدْرُ ذَلِكَ مَسْقَطَ جَسَدِ إِنْسَانٍ إِذَا سَجَدَ.
Zurarah narrated from Imam Muhammad ibn Ali Al-Baqir عليه السلام that He said: "The rows (in prayer) should be complete and continuous, one row connected to another, and there should not be a gap between the rows that cannot be crossed, such that it should only be the space of a human body when in prostration”.
- Ṣaḥīḥ al-Faqīh, p. 54