Ablutions (Wudu')

Bukhari :: Book 1 :: Volume 4 :: Hadith 137

Narrated Abu Huraira:

Allah's Apostle said, "The prayer of a person who does ,Hadath (passes, urine, stool or wind) is not accepted till he performs (repeats) the ablution." A person from Hadaramout asked Abu Huraira, "What is 'Hadath'?" Abu Huraira replied, " 'Hadath' means the passing of wind from the anus."