[Machine] The Messenger of Allah, ﷺ , performed the prayer and recited Surah An-Najm. He prostrated with us for a long time, and more people joined. Some of them prayed on the backs of others.  

صَلَّى رَسُولُ اللهِ ﷺ فَقَرَأَ النَّجْمَ فَسَجَدَ بِنَا فَأَطَالَ السُّجُودَ وَكَثُرَ النَّاسُ فَصَلَّى بَعْضُهُمْ عَلَى ظَهْرِ بَعْضٍ  

I heard 'Umar giving a khutbah, and he said: The Messenger of Allah ﷺ built this mosque and we, the Muhajireen and Ansar, were with him. If it gets too crowded, then let one of you prostrate on his brother's back. And he saw people (on one occasion) praying in the street and said: Pray in the mosque, (Using translation from Aḥmad 217)   

سَمِعْتُ عُمَرَ بْنَ الْخَطَّابِ ؓ يَخْطُبُ وَهُوَ يَقُولُ يَا أَيُّهَا النَّاسُ إِنَّ رَسُولَ اللهِ ﷺ بَنَى هَذَا الْمَسْجِدَ وَنَحْنُ مَعَهُ وَالْمُهَاجِرُونَ وَالْأَنْصَارُ فَإِذَا اشْتَدَّ الزِّحَامُ فَلْيَسْجُدِ الرَّجُلُ مِنْكُمْ عَلَى ظَهْرِ أَخِيهِ  

[Machine] If the heat intensifies, let him prostrate on his garment, and if the crowd intensifies, let one of you prostrate on the back of his brother.  

إِذَا اشْتَدَّ الْحَرُّ فَلْيَسْجُدْ عَلَى ثَوْبِهِ وَإِذَا اشْتَدَّ الزِّحَامُ فَلْيَسْجُدْ أَحَدُكُمْ عَلَى ظَهْرِ أَخِيهِ