Ibn Umar (G. p. H) a narrated: "That the Prophet (P. B. U. H) used to read Quran, and when he would read a sura which contained a prostration, he would prostrate and we would prostrate with him so that some of us could not find a place for their forehead".

[Muslim, Vol. 1, The Book of Mosques and Places of Prayer, Chapter 20/103].