Sahih al-Bukhari, Book 59, Hadith 71 (In-Book) ⓘ
Narrated Abu Jamra Ad-Dabi: I used to sit with Ibn `Abbas in Mecca. Once I had a fever and he said (to me), "Cool your fever with Zamzam water, for Allah's Messenger said: 'It, (the Fever) is from the heat of the (Hell) Fire; so, cool it with water (or Zamzam water).
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، حَدَّثَنَا أَبُو عَامِرٍ، حَدَّثَنَا هَمَّامٌ، عَنْ أَبِي جَمْرَةَ الضُّبَعِيِّ، قَالَ كُنْتُ أُجَالِسُ ابْنَ عَبَّاسٍ بِمَكَّةَ، فَأَخَذَتْنِي الْحُمَّى، فَقَالَ أَبْرِدْهَا عَنْكَ بِمَاءِ زَمْزَمَ، فَإِنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " الْحُمَّى مِنْ فَيْحِ جَهَنَّمَ فَأَبْرِدُوهَا بِالْمَاءِ ". أَوْ قَالَ " بِمَاءِ زَمْزَمَ ". شَكَّ هَمَّامٌ.
also referenced under: Hadith 3261 (DarusSalam) & Volume 4, Book 54, Hadith 483 (USC-MSA)