Why do you stand in rows as the angels do in the presence of their Lord? We asked: how do the angles stand in rows in the presence of their Lord? He replied: they make the first row complete and keep close together in the row.
قَالَ رَسُولُ اللَّهِ ﷺ أَلاَ تَصُفُّونَ كَمَا تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهِمْ جَلَّ وَعَزَّ قُلْنَا وَكَيْفَ تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهِمْ قَالَ يُتِمُّونَ الصُّفُوفَ الْمُقَدَّمَةَ وَيَتَرَاصُّونَ فِي الصَّفِّ