"The Messenger of Allah ﷺturned to face us when he stood up to pray, before he said the Takbir and said: 'Make your rows straight and come close to one another, for I can see you behind my back."'  

أَقْبَلَ عَلَيْنَا رَسُولُ اللَّهِ ﷺ بِوَجْهِهِ حِينَ قَامَ إِلَى الصَّلاَةِ قَبْلَ أَنْ يُكَبِّرَ فَقَالَ أَقِيمُوا صُفُوفَكُمْ وَتَرَاصُّوا فَإِنِّي أَرَاكُمْ مِنْ وَرَاءِ ظَهْرِي  

"Make your rows solid and close together, and keep your necks in line. By the One in Whose Hand is the soul of Muhammad! I can see the shaitan entering through the gaps in the rows as if they are small sheep."  

أَنَّ نَبِيَّ اللَّهِ ﷺ قَالَ رَاصُّوا صُفُوفَكُمْ وَقَارِبُوا بَيْنَهَا وَحَاذُوا بِالأَعْنَاقِ فَوَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ إِنِّي لأَرَى الشَّيَاطِينَ تَدْخُلُ مِنْ خَلَلِ الصَّفِّ كَأَنَّهَا الْحَذَفُ  

"The Messenger of Allah ﷺ came out to us and said:'Will you not form rows as the angels form rows before their Lord? They said: 'How do the angels form rows before their lord? He said: 'They complete the first row and fill the gaps in the rows."'  

خَرَجَ إِلَيْنَا رَسُولُ اللَّهِ ﷺ فَقَالَ أَلاَ تَصُفُّونَ كَمَا تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهِمْ قَالُوا وَكَيْفَ تَصُفُّ الْمَلاَئِكَةُ عِنْدَ رَبِّهِمْ قَالَ يُتِمُّونَ الصَّفَّ الأَوَّلَ ثُمَّ يَتَرَاصُّونَ فِي الصَّفِّ