Sahih Muslim , Book 4, Hadith 1287 (USC-MSA) ⓘ
Abu Huraira reported that the Messenger of Allah said: This heat is from the exhalation of Hell-fire, so delay the prayer till it is cool.
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا عَبْدُ الْعَزِيزِ، عَنِ الْعَلاَءِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِنَّ هَذَا الْحَرَّ مِنْ فَيْحِ جَهَنَّمَ فَأَبْرِدُوا بِالصَّلاَةِ " .
also referenced under: Book 5, Hadith 234 (In-Book) & Hadith 615 (Reference)