The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1193
Abu Salama b. 'Abual-Rahman reported: Abu Huraira recited before them:" hen the heaven burst asunder" (al-Qur'an, lxxxiv. 1) and performed prostration. After completing (the prayer) he informed them that the Messenger of Allah (may peace be upon him) has prostrated himself at it (this verse).