Imam Muslim : 901
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ عَنْ نَافِعٍ عَنْ ابْنِ عُمَرَ قَالَ رُبَّمَا قَرَأَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْقُرْآنَ فَيَمُرُّ بِالسَّجْدَةِ فَيَسْجُدُ بِنَا حَتَّى ازْدَحَمْنَا عِنْدَهُ حَتَّى مَا يَجِدُ أَحَدُنَا مَكَانًا لِيَسْجُدَ فِيهِ فِي غَيْرِ صَلَاةٍ
Narrated to us by Abu Bakr bin Abu Shaibah, he narrated to us Muhammad bin Bishr, he narrated to us 'Ubaidullah bin Umar from Nafi' from Ibn Umar, he said, sometimes the Messenger of Allah peace be upon him prostrated when reading the Quran passing a prostration verse, then he prostrated with us until we felt cramped when with him, to the point that one of us could not find a place to prostrate, and that was outside of prayer time.