Al-Kāfi
Hadith 14973ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَنْ سَعِيدٍ الأعْرَجِ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلام) عَنْ الرَّجُلِ يَأْتِي الصَّلاَةَ فَلاَ يَجِدُ فِي الصَّفِّ مَقَاماً أَ يَقُومُ وَحْدَهُ حَتَّى يَفْرُغَ مِنْ صَلاَتِهِ قَالَ نَعَمْ لاَ بَأْسَ أَنْ يَقُومَ بِحِذَاءِ الإِمَامِ.
3. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sa‘id al-A’raj who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who comes to Salah (prayer) and does not find a place in the rows. Can he stand up alone until Salah (prayer) is complete? He (the Imam) said, ‘Yes, it is not an offense to stand parallel to the Imam.’”