The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1288
Hammam b. Munabbih reported: This is what Abu Huraira narrated to us from the Holy Prophet and he transmitted some ahadith-one of them was that the Messenger of Allah (may peace be upon him) said: Let the heat become less severe before prayer, for the intensity of heat is from the exhalation of Hell.
Source materials are from the University of Southern California MSA site|
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