Narrated Abu Huraira: The Prophet said, "In very hot weather delay the Zuhr prayer till it becomes (a bit) cooler because the severity of 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: 536
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة