(135) No Salat (prayer) is accepted without ablution (i.e. to remove, the small Hadath by ablution or the big Hadath by taking a bath)
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 the ablution. A person from Hadaramout asked Abu Huraira, What is 'Hadath'? Abu Huraira replied, 'Hadath' means the passing of wind.