"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."' (Using translation from Nasāʾī 814)  

أَقْبَلَ عَلَيْنَا رَسُولُ اللهِ ﷺ بِوَجْهِهِ حِينَ قَامَ إِلَى الصَّلَاةِ قَبْلَ أَنْ يُكَبِّرَ قَالَ «أَقِيمُوا صُفُوفَكُمْ وَتَرَاصُّوا فَإِنِّي أَرَاكُمْ مِنْ وَرَاءِ ظَهْرِي»  

«رَاصُّوا صُفُوفَكُمْ وَحَاذُوا بِالْأَعْنَاقِ»  

"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."' (Using translation from Nasāʾī 816)  

خَرَجَ إِلَيْنَا رَسُولُ اللهِ ﷺ فَقَالَ «أَلَا تَصُفُّونَ كَمَا تَصُفُّ الْمَلَائِكَةُ عِنْدَ رَبِّهِمْ؟» قَالُوا وَكَيْفَ تَصُفُّ الْمَلَائِكَةُ عِنْدَ رَبِّهِمْ؟ قَالَ «يُتِمُّونَ الصَّفَّ الْأَوَّلَ وَيَتَرَاصُّونَ فِي الصَّفِّ»