The Messenger of Allah ﷺ said: When it is a hot day, (delay) the prayer till the extreme heat passes away, for the intensity of heat is from the exhalation of Hell. Abu Huraira reported that the Messenger of Allah ﷺ said: Refrain from saying (the noon prayer) till the extreme heat passes away, for the Intensity of heat is from the exhalation of Hell. Abu Huraira narrated this hadith from the Messenger of Allah (may peace be up on him) by another chain of transmitters.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا كَانَ الْيَوْمُ الْحَارُّ فَأَبْرِدُوا بِالصَّلاَةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ قَالَ عَمْرٌو وَحَدَّثَنِي أَبُو يُونُسَ عَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ أَبْرِدُوا عَنِ الصَّلاَةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ قَالَ عَمْرٌو وَحَدَّثَنِي ابْنُ شِهَابٍ عَنِ ابْنِ الْمُسَيَّبِ وَأَبِي سَلَمَةَ عَنْ أَبِي هُرَيْرَةَ عَنْ رَسُولِ اللَّهِ ﷺ بِنَحْوِ ذَلِكَ