Beginning of Creation

Bukhari :: Book 4 :: Volume 54 :: Hadith 452

Narrated Abu Huraira:

The Prophet said, "As long as any-one of you is waiting for the prayer, he is considered to be praying actually, and the angels say, 'O Allah! Be merciful to him and forgive him', (and go on saying so) unless he leaves his place of praying or passes wind (i.e. breaks his ablution)."