The Mu'adhdbin (the announcer of the hour of prayer) of the Messenger of Allah ﷺ called for the noon prayer. Upon this the Messenger of Allah ﷺ said: Let it cool down, let it cool down, or he said: Wait, wait for the intensity of heat is from the exhalation of Hell. When the heat is intense, delay the prayer till it becomes cooler. Abu Dharr said: (We waited) till we saw the shadow of the mounds.  

أَذَّنَ مُؤَذِّنُ رَسُولِ اللَّهِ ﷺ بِالظُّهْرِ فَقَالَ النَّبِيُّ ﷺ أَبْرِدْ أَبْرِدْ أَوْ قَالَ انْتَظِرِ انْتَظِرْ وَقَالَ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلاَةِ قَالَ أَبُو ذَرٍّ حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ  

"The Messenger of Allah ﷺ said: 'If it is very hot, wait until it cools down before you pray, for intense heat is a breeze from Hell.'"  

إِنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلاَةِ 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)  

قَالَ رَسُولُ اللهِ ﷺ إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلَاةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ  

The Mu'adh-dhin (call-maker) of the Prophet ﷺ pronounced the Adhan (call) for the Zuhr prayer but the Prophet said, "Let it be cooler, let it be cooler." Or said, 'Wait, wait, because the severity of heat is from the raging of the Hell-fire. In severe hot weather, pray when it becomes (a bit) cooler and the shadows of hillocks appear." (Using translation from Bukhārī 535)  

أَذَّنَ مُؤَذِّنُ رَسُولِ اللهِ ﷺ بِالظُّهْرِ فَقَالَ النَّبِيُّ ﷺ أَبْرِدْ أَبْرِدْ أَوْقَالَ انْتَظِرْ انْتَظِرْ وَقَالَ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلَاةِ قَالَ أَبُو ذَرٍّ حَتَّى رَأَيْنَا فَيْءَ التُّلُولِ  

[Machine] Abu Dharr heard the Messenger of Allah ﷺ saying: "We were with the Messenger of Allah ﷺ during a journey and the Muadhin intended to call the Adhan for Dhur prayer. The Prophet ﷺ told him, 'Cool down.' Then he intended to call the Adhan again and the Prophet ﷺ told him, 'Cool down' two or three times until we saw the shadow of a hillock. The Prophet ﷺ then said, 'Indeed, the intense heat is a portion of the Hellfire. So when it is extremely hot, cool yourselves with prayer.'"  

سَمِعَ أَبَا ذَرٍّ يَقُولُ كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ فِي سَفَرٍ فَأَرَادَ الْمُؤَذِّنُ أَنْ يُؤَذِّنَ بِالظُّهْرِ فَقَالَ لَهُ النَّبِيُّ ﷺ «أَبْرِدْ» ثُمَّ أَرَادَ أَنْ يُؤَذِّنَ فَقَالَ لَهُ «أَبْرِدْ» مَرَّتَيْنِ أَوْ ثَلَاثًا حَتَّى رَأَيْنَا فَيْءَ التُّلُولِ وَقَالَ «إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلَاةِ»  

" كُنَّا مَعَ رَسُولِ الله ﷺ فيِ مَسِيرٍ فَأَرَادَ بِلَالٌ أَنْ يُؤَذِّنَ، فَقَالَ رَسُولُ الله ﷺ أَبْرِدْ، ثُمَّ أَرَادَ أَنْ يُؤَذِّنَ، فَقَالَ لَهُ: أَبْرِدْ، حَتَّي رَأَيْنَا فيِ الْبَلُولِ، ثُمَّ أَذَّنَ فَصَلَّي الظُّهْرَ، ثُمَّ قَالَ: إِن شِدَّةَ الْحَرِّ مِنْ فَيحِ جَهَنَّمَ، فَإِذَا اشْتَدَّ الْحَرُّ فأبردوا بِالصَّلَاةِ".