حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، وَمُسَدَّدٌ، قَالاَ حَدَّثَنَا عَبَّادُ بْنُ عَبَّادٍ، حَدَّثَنَا مُحَمَّدُ بْنُ عَمْرٍو، عَنْ سَعِيدِ بْنِ الْحَارِثِ الأَنْصَارِيِّ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، قَالَ كُنْتُ أُصَلِّي الظُّهْرَ مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم فَآخُذُ قَبْضَةً مِنَ الْحَصَى لِتَبْرُدَ فِي كَفِّي أَضَعُهَا لِجَبْهَتِي أَسْجُدُ عَلَيْهَا لِشِدَّةِ الْحَرِّ ‏.‏

Abu Dharr said

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.