(5) باب مَا جَاءَ فِي تَأْخِيرِ الظُّهْرِ فِي شِدَّةِ الْحَرِّ
Abu Dharr narrated:
"Allah's Messenger was on a journey and Bilal was with him. So he wanted to call for the prayer, but he (the Prophet) said: 'Let it get cooler.' Then he wanted to call for the prayer, so Allah's Messenger said: 'Let it get to the cooler time of Zuhr.'" He (i.e., Abu Dharr) said: "Until we saw the shadows of the hillocks, then he commanded that the Iqamah be called and then led the people in prayer. Allah's Messenger said: 'The severity of heat is from the raging of Hell, so wait until it becomes cooler for the (Zuhr) prayer.'"
Reference: Jami` at-Tirmidhi 158
In-book reference: Book 2, Hadith 10
English translation: Vol. 1, Book 2, Hadith 158