Sahih Muslim Book - 39, Hadith - 5757

وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا عَبْدَةُ بْنُ سُلَيْمَانَ ، عَنْ هِشَامٍ ، عَنْ فَاطِمَةَ ، عَنْ أَسْمَاءَ ، أَنَّهَا كَانَتْ تُؤْتَى بِالْمَرْأَةِ الْمَوْعُوكَةِ ، فَتَدْعُو بِالْمَاءِ فَتَصُبُّهُ فِي جَيْبِهَا ، وَتَقُولُ: إِنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: ابْرُدُوهَا بِالْمَاءِ وَقَالَ: إِنَّهَا مِنْ فَيْحِ جَهَنَّمَ.

It was narrated from Asma’ that a woman who was running a high fever was brought to her. She called for some water and sprinkled it in the neckline of her garment and said: “The Messenger of Allah (s.a.w) said: ‘Cool it down with water.’ And he said: ‘It is from the heat of Hell.”’