(9) باب الإِبْرَادِ بِالظُّهْرِ فِي شِدَّةِ الْحَرِّ
Narrated Abu Huraira:
The Prophet (ﷺ) 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. The Hell-fire of Hell complained to its Lord saying: O Lord! My parts are eating (destroying) one another. So Allah allowed it to take two breaths, one in the winter and the other in the summer. The breath in the summer is at the time when you feel the severest heat and the breath in the winter is at the time when you feel the severest cold."
Reference: Sahih al-Bukhari 536, 537
In-book reference: Book 9, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 10, Hadith 512