Narrated Abu Huraira and `Abdullah bin `Umar: Allah's Apostle said, "If it is very hot, then pray the Zuhr prayer when it becomes (a bit) cooler, as the severity of the heat is from the raging of the Hell-fire."
Hadith ReferenceSahih Bukhari / The Book of The Times of As-Salat (The Prayers) and Its Superiority / Hadith: 533
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة