Mukhtasar Bukhari (Abridged) 574 — If crowded, unable to prostrate

Narrated Abdullah bin Umar (may Allah be pleased with them): The Prophet (peace and blessings of Allah be upon him) would recite before us a Surah in which there was a verse of prostration, so he (peace be upon him) would perform prostration and we (also at that time) would perform prostration with him (peace be upon him), so much so that we would crowd together, to the extent that some of us would not find a place to put their forehead to perform prostration.