عَنْ سَيَّارِ بْنِ الْمَعْرُورِ قَالَ سَمِعْتُ عُمَرَ (رَضِيَ اللَّهُ عَنْهُ) وَهُوَ يَخْطُبُ يَقُولُ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ بَنَى هَٰذَا الْمَسْجِدَ وَنَحْنُ مَعَهُ الْمُهَاجِرُونَ وَالْأَنْصَارُ فَإِذَا اشْتَدَّ الزِّحَامُ فَلْيَسْجُدِ الرَّجُلُ مِنْكُمْ عَلَى ظَهْرِ أَخِيهِ، وَرَأَى قَوْمًا يُصَلُّونَ فِي الطَّرِيقِ فَقَالَ صَلُّوا فِي الْمَسْجِدِ
Sayyar bin Ma’rur says: Sayyiduna Umar (may Allah be pleased with him) said in a sermon: Indeed, the Messenger of Allah (peace and blessings be upon him) built this mosque, and only we, the Muhajirun and Ansar, were with him (peace and blessings be upon him). Then, when the crowd increases, a man should prostrate on his brother’s back. Then, seeing some people praying on the road, he said: Pray in the mosque.