Hadith 535 - Times of the Prayers - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

9. Times of the Prayers - كتاب مواقيت الصلاة

9) Chapter: In severe heat, offer Zuhr prayers when it becomes (a bit) cooler

Narrated Abu Dhar:

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."

Reference: 535
English reference: Vol. 1, Book 10, Hadith 511
In-book reference: Book 9, Hadith 13
Grade: Sahih
Read this hadith from Darussalam Collection

9) باب الإِبْرَادِ بِالظُّهْرِ فِي شِدَّةِ الْحَرِّ

حَدَّثَنَا ابْنُ بَشَّارٍ، قَالَ حَدَّثَنَا غُنْدَرٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ الْمُهَاجِرِ أَبِي الْحَسَنِ، سَمِعَ زَيْدَ بْنَ وَهْبٍ، عَنْ أَبِي ذَرٍّ، قَالَ أَذَّنَ مُؤَذِّنُ النَّبِيِّ صلى الله عليه وسلم الظُّهْرَ فَقَالَ ‏"‏ أَبْرِدْ أَبْرِدْ ـ أَوْ قَالَ ـ انْتَظِرِ انْتَظِرْ ‏"‏‏.‏ وَقَالَ ‏"‏ شِدَّةُ الْحَرِّ مِنْ فَيْحِ جَهَنَّمَ، فَإِذَا اشْتَدَّ الْحَرُّ فَأَبْرِدُوا عَنِ الصَّلاَةِ ‏"‏‏.‏ حَتَّى رَأَيْنَا فَىْءَ التُّلُولِ‏.‏