Sahih Muslim Book 4, Hadith Number 1193.

Chapter : Forgetfulness in prayer and prostration as compensation for it.

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).