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."  

أَذَّنَ مُؤَذِّنُ النَّبِيِّ ﷺ الظُّهْرَ فَقَالَ أَبْرِدْ أَبْرِدْ أَوْ قَالَ انْتَظِرِ انْتَظِرْ وَقَالَ شِدَّةُ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلاَةِ حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ  

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  

"Messenger of Allah was on a journey and Bilal was with him. So he wanted to call for the prayer, but he (the Prophet) said: 'Let it get cooler.' Then he wanted to call for the prayer, so Messenger of Allah said: 'Let it get to the cooler time of Zuhr.'" He (i.e., Abu Dharr) said: "Until we saw the shadows of the hillocks, then he commanded that the Iqamah be called and then led the people in prayer. Messenger of Allah said: 'The severity of heat is from the raging of Hell, so wait until it becomes cooler for the (Zuhr) prayer.'"  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ فِي سَفَرٍ وَمَعَهُ بِلاَلٌ فَأَرَادَ بِلاَلٌ أَنْ يُقِيمَ فَقَالَ أَبْرِدْ ثُمَّ أَرَادَ أَنْ يُقِيمَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَبْرِدْ فِي الظُّهْرِ قَالَ حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ ثُمَّ أَقَامَ فَصَلَّى فَقَالَ رَسُولُ اللَّهِ ﷺ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَأَبْرِدُوا عَنِ الصَّلاَةِ  

Yahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah ﷺ said, "When the heat is fierce, wait until it gets cooler before you do the prayer, for scorching heat is from the blast of Jahannam."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلاَةِ فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ  

[Machine] "We came from a funeral, and we passed by Abu Dharr. He said, 'We were with the Prophet ﷺ on a journey when the Muadhin (caller to prayer) wanted to call the Adhan for Dhuhr prayer. The Prophet ﷺ said, 'Cool down (wait), then he wanted to call the Adhan again, and the Prophet ﷺ said, 'Cool down,' and on the third time he said, 'The third time is the most knowledgeable. Then we saw the shade of a tree and the Prophet ﷺ said, 'Indeed, the intensity of the heat is from the heat of Hellfire, so when the heat intensifies, cool down with prayer.'"  

جِئْنَا مِنْ جَنَازَةٍ فَمَرَرْنَا بِأَبِي ذَرٍّ فَقَالَ كُنَّا مَعَ رَسُولِ اللهِ ﷺ فِي سَفَرٍ فَأَرَادَ الْمُؤَذِّنُ أَنْ يُؤَذِّنَ لِلظُّهْرِ فَقَالَ رَسُولُ اللهِ ﷺ أَبْرِدْ ثُمَّ أَرَادَ أَنْ يُؤَذِّنَ فَقَالَ لَهُ أَبْرِدْ وَالثَّالِثَةَ أَكْبَرُ عِلْمِي شُعْبَةُ قَالَ لَهُ حَتَّى رَأَيْنَا فَيْءَ التُّلُولِ قَالَ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلَاةِ  

[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»  

[Machine] The Prophet ﷺ called the Muadhin to give the call to the Dhuhr prayer, then he said to him, "Make it cooler, make it cooler." He also said, "Wait, wait." He said, "Indeed, the intensity of the heat is from the breath of Hell, so when it gets very hot, cool down from praying." Abu Dharr said, "We kept waiting until we saw the white mark on the horizon."  

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

" 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".