(9) باب ازْدِحَامِ النَّاسِ إِذَا قَرَأَ الإِمَامُ السَّجْدَةَ
Narrated Ibn `Umar:
When the Prophet (ﷺ) recited Surat As-Sajda and we were with him, he would prostrate and we also would prostrate with him and some of us (because of the heavy rush) would not find a place (for our foreheads) to prostrate on.
Reference: Sahih al-Bukhari 1076
In-book reference: Book 17, Hadith 10
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 19, Hadith 182