Sahih Bukhari Volume 002, Book 019, Hadith Number 182.

Narated By Ibn 'Umar : When the Prophet 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.

Related Hadith(s)