Language:
كتاب سجود القرآن
17  
Prostration During Recital of Qur'an
(12)
Chapter: Whoever does not find a place for prostration (with the Imam) because of overcrowding
(12)
باب مَنْ لَمْ يَجِدْ مَوْضِعًا لِلسُّجُودِ مِنَ الزِّحَامِ
Sahih al-Bukhari 1079

Narrated Ibn `Umar.:

Whenever the Prophet (ﷺ) recited the Sura which contained the prostration of recitation he used to prostrate and then, we, too, would prostrate and some of us did not find a place for prostration.

حَدَّثَنَا صَدَقَةُ، قَالَ أَخْبَرَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يَقْرَأُ السُّورَةَ الَّتِي فِيهَا السَّجْدَةُ فَيَسْجُدُ وَنَسْجُدُ حَتَّى مَا يَجِدُ أَحَدُنَا مَكَانًا لِمَوْضِعِ جَبْهَتِهِ‏.‏
Reference : Sahih al-Bukhari 1079
In-book reference : Book 17, Hadith 13
USC-MSA web (English) reference : Vol. 2, Book 19, Hadith 185
  (deprecated numbering scheme)