صَحِيحُ مُسْلِمٍ
Sahih Muslim 617 a
The Book of Mosques and Places of Prayer
The recommendation to delay Zuhr (until it has cooled down) in severe heat for one who finds it too hot in route to join the congregation
وَحَدَّثَنِي عَمْرُو بْنُ سَوَّادٍ، وَحَرْمَلَةُ بْنُ يَحْيَى، - وَاللَّفْظُ لِحَرْمَلَةَ - أَخْبَرَنَا ابْنُ وَهْبٍ، أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنِي أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ، أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم اشْتَكَتِ النَّارُ إِلَى رَبِّهَا فَقَالَتْ يَا رَبِّ أَكَلَ بَعْضِي بَعْضًا . فَأَذِنَ لَهَا بِنَفَسَيْنِ نَفَسٍ فِي الشِّتَاءِ وَنَفَسٍ فِي الصَّيْفِ فَهُوَ أَشَدُّ مَا تَجِدُونَ مِنَ الْحَرِّ وَأَشَدُّ مَا تَجِدُونَ مِنَ الزَّمْهَرِيرِ .
Abu Huraira reported: The Messenger of Allah (ﷺ) said: The Fire made a complaint before the Lord saying." O Lord, some parts of mine have consumed the others." So it was allowed to take two exhalations, one exhalation in winter and the other exhalation in summer. That is why you find extreme heat (in summer) and extreme cold (in winter).
Sahih Muslim, 617 aSahihصحيح