(32) باب اسْتِحْبَابِ الإِبْرَادِ بِالظُّهْرِ فِي شِدَّةِ الْحَرِّ لِمَنْ يَمْضِي إِلَى جَمَاعَةٍ وَيَنَالُهُ الْحَرُّ فِي طَرِيقِهِ
Abu Huraira reported that the Messenger of Allah (may peace he upon him) said:
When it is very hot, say (the noon prayer) when the extreme heat passes away, for intensity of heat is from the exhalation of Hell.
Reference: Sahih Muslim 615 a
In-book reference: Book 5, Hadith 229
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1282