"The Messenger of Allah said: 'When it is very hot, then wait for it to cool down before you pray, for intense heat is from the flaring up of the Hell-fire.'" (Using translation from Ibn Mājah 677)  

سَمِعْتُ رَسُولَ اللهِ ﷺ قَالَ «إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلَاةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ»  

"The Messenger of Allah said: 'When it is very hot, then wait for it to cool down before you pray, for intense heat is from the flaring up of the Hell-fire.'" (Using translation from Ibn Mājah 677)  

عَنِ النَّبِيِّ ﷺ قَالَ «إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلَاةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ»  

Messenger of Allah ﷺ said, "If it is very hot, then pray the Zuhr prayer when it becomes (a bit) cooler, as the severity of the heat is from the raging of the Hell-fire." (Using translation from Bukhārī 533)  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ «إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلَاةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ»  

[Machine] On the authority of the Prophet ﷺ and Abu Zur'ah ibn 'Amr, from Thabit ibn Qais, from Abu Musa who reported: "Cool yourselves at midday, for what you find of the heat is the breath of Hellfire."  

عَنِ النَّبِيِّ ﷺ وَعَنْ أَبِي زُرْعَةَ بْنِ عَمْرٍو عَنْ ثَابِتِ بْنِ قَيْسٍ عَنْ أَبِي مُوسَى يَرْفَعُهُ قَالَ «أَبْرِدُوا بِالظُّهْرِ فَإِنَّ الَّذِي تَجِدُونَهُ مِنَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ»  

"We complained to the Messenger of Allah about the heat of the sunbaked ground, but he did not respond to our complaint." (Using translation from Ibn Mājah 676)  

«شَكَوْنَا إِلَى رَسُولِ اللهِ ﷺ حَرَّ الرَّمْضَاءِ فَلَمْ يُشْكِنَا»  

The extent of the shadow when the Messenger of Allah prayed (the noon prayer) was three to five feet in summer and five to seven feet in winter. (Using translation from Abū Dāʾūd 400)  

كَانَ «قَدْرُ صَلَاةِ رَسُولِ اللهِ ﷺ الظُّهْرَ فِي الصَّيْفِ ثَلَاثَةَ أَقْدَامٍ إِلَى خَمْسَةِ أَقْدَامٍ وَفِي الشِّتَاءِ خَمْسَةَ أَقْدَامٍ إِلَى سَبْعَةِ أَقْدَامٍ»