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Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
abudawud:401 – Abū al-Walīd al-Ṭayālisī > Shuʿbah

We were in the company of the Prophet ﷺ. The mu'adhdhin intended to call for the Zuhr prayer. He said: Make it cooler. He then intended to call for prayer. He said twice or thrice: Make it cooler. We then witnessed the shadow of the mounds. He then said: The intensity of heat comes from the bubbling over of the Hell ; so when the heat is violent, offer (the Zuhr) prayer when it becomes cooler.  

أبو داود:٤٠١ – حَدَّثَنَا أَبُو الْوَلِيدِ الطَّيَالِسِيُّ حَدَّثَنَا شُعْبَةُ أَخْبَرَنِي أَبُو الْحَسَنِ
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قَالَ أَبُو دَاوُدَ أَبُو الْحَسَنِ هُوَ مُهَاجِرٌ قَالَ سَمِعْتُ زَيْدَ بْنَ وَهْبٍ يَقُولُ سَمِعْتُ أَبَا ذَرٍّ يَقُولُ كُنَّا مَعَ النَّبِيِّ ﷺ فَأَرَادَ الْمُؤَذِّنُ أَنْ يُؤَذِّنَ الظُّهْرَ فَقَالَ أَبْرِدْ ثُمَّ أَرَادَ أَنْ يُؤَذِّنَ فَقَالَ أَبْرِدْ مَرَّتَيْنِ أَوْ ثَلاَثًا حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ ثُمَّ قَالَ إِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا بِالصَّلاَةِ