Hadithcore
Sahih al-Bukhari, 539
sahih

Narrated Abu Dhar Al-Ghifar:

We were with the Prophet (ﷺ) on a journey and the Mu'adh-dhin (call maker for the prayer) wanted to pronounce the Adhan (call) for the Zuhr prayer. The Prophet (ﷺ) said, 'Let it become cooler." He again (after a while) wanted to pronounce the Adhan but the Prophet (ﷺ) said to him, "Let it become cooler till we see the shadows of hillocks." The Prophet (ﷺ) added, "The severity of heat is from the raging of the Hell-fire, and in very hot weather pray (Zuhr) when it becomes cooler."

حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ حَدَّثَنَا مُهَاجِرٌ أَبُو الْحَسَنِ، مَوْلًى لِبَنِي تَيْمِ اللَّهِ قَالَ سَمِعْتُ زَيْدَ بْنَ وَهْبٍ، عَنْ أَبِي ذَرٍّ الْغِفَارِيِّ، قَالَ كُنَّا مَعَ النَّبِيِّ صلى الله عليه وسلم فِي سَفَرٍ، فَأَرَادَ الْمُؤَذِّنُ أَنْ يُؤَذِّنَ لِلظُّهْرِ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ أَبْرِدْ ‏"‏‏.‏ ثُمَّ أَرَادَ أَنْ يُؤَذِّنَ فَقَالَ لَهُ ‏"‏ أَبْرِدْ ‏"‏‏.‏ حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ، فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلاَةِ ‏"‏‏.‏ وَقَالَ ابْنُ عَبَّاسٍ تَتَفَيَّأُ تَتَمَيَّلُ‏.‏

References2 variants
In-Book Reference
Book 9, Hadith 16
USC-MSA web (English) reference
Vol. 1, Book 10, Hadith 514 (deprecated numbering scheme)
Sharh · explanationclick to expand
There are many examples that illustrate the easy-going nature of Islamic teachings. One example of that is that for each prayer there is a considerable amount of time during which the prayer may be offered, so as to avoid hardship and difficulty. In this hadith, Abu Dharr al-Ghifari (may Allah be pleased with him) tells us that they were with the Prophet (blessings and peace of Allah be upon him) on a journey, and the mu’adhdhin wanted to give the call to prayer for Zuhr, but the Prophet (blessings and peace of Allah be upon him) told him to delay it until it had cooled down and the heat had dissipated, so he sat down. Then after a while he wanted to give the call to prayer, but the Prophet (blessings and peace of Allah be upon him) said to him: “Wait until it cools down.” Then when they saw the shadow of the high ground begin to appear, as a result of the delay, at that point the Prophet (blessings and peace of Allah be upon him) said: “Intense heat is from the exhalation of hell – meaning from its scorching heat – so when it is intensely hot, wait until it cools down before you pray.” In the case of Zuhr, waiting until it cools down means delaying going out to offer the prayer until it has cooled down and the heat has reduced in comparison to the heat at the beginning of the noontime..
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