PRaying when it becomes cooler

 212. Abu Dhar narrated: The Mu´adhdhin of the Messenger of Allah salla alayhi wa sallam called the Adhan for the Zuhr. Upon this the Prophet salla alayhi wa sallam said: ´´Let it cool down, let it cool down (or he said: Wait, wait),´´ he then said, ´´The severity of heat if from the exhalation of Hell. When the heat is severe, delay the prayer until it becomes cooler.´´ Abu Dhar said: (We waited) until one could see the shadow of the hillocks.