Language:
كتاب سجود القرآن
17  
Prostration During Recital of Qur'an
(8)
Chapter: Whoever prostrated with the prostration of the reciter
(8)
باب مَنْ سَجَدَ لِسُجُودِ الْقَارِئِ
Sahih al-Bukhari 1075

Narrated Ibn `Umar:

When the Prophet (ﷺ) recited a Sura that contained the prostration he would prostrate and we would do the same and some of us (because of the heavy rush) could not find a place for prostration.

حَدَّثَنَا مُسَدَّدٌ، قَالَ حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ حَدَّثَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يَقْرَأُ عَلَيْنَا السُّورَةَ فِيهَا السَّجْدَةُ، فَيَسْجُدُ وَنَسْجُدُ، حَتَّى مَا يَجِدُ أَحَدُنَا مَوْضِعَ جَبْهَتِهِ‏.‏
Reference : Sahih al-Bukhari 1075
In-book reference : Book 17, Hadith 9
USC-MSA web (English) reference : Vol. 2, Book 19, Hadith 181
  (deprecated numbering scheme)