for the sake of respecting the prophet (saw).

What did the Messenger of Allah (peace be upon him) do when Abu Huraira recited "hen the heaven burst asunder" (al-Qur'an, lxxxiv. 1)?
 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).