Sahih al-Bukhari 3258
Sahih al-Bukhari · Book 59: Beginning of Creation · The description of the (Hell) Fire and the fact that it has already been created
Narrated Abu Dhar:
حَدَّثَنَا أَبُو الْوَلِيدِ ، حَدَّثَنَا شُعْبَةُ ، عَنْ مُهَاجِرٍ أَبِي الْحَسَنِ ، قَالَ سَمِعْتُ زَيْدَ بْنَ وَهْبٍ ، يَقُولُ سَمِعْتُ أَبَا ذَرٍّ ـ رضى الله عنه ـ يَقُولُ كَانَ النَّبِيُّ صلى الله عليه وسلم فِي سَفَرٍ فَقَالَ " أَبْرِدْ ". ثُمَّ قَالَ " أَبْرِدْ ". حَتَّى فَاءَ الْفَىْءُ، يَعْنِي لِلتُّلُولِ، ثُمَّ قَالَ " أَبْرِدُوا بِالصَّلاَةِ، فَإِنَّ شِدَّةَ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ " .
While the Prophet (ﷺ) was on a journey, he said (regarding the performance of the Zuhr prayer), "Wait till it (i.e. the weather) gets cooler." He said the same again till the shade of the hillocks extended. Then he said, "Delay the (Zuhr) Prayer till it gets cooler, for the severity of heat is from the increase in heat of Hell (fire).