"When one of you suffers from fever - and indeed fever is a piece of the Fire - let him extinguish it with water. Let him stand in a flowing river facing the direction of it and say: Allahummashfi 'abdaka wa saddik Rasulak ('In the name off Allah. O Allah! Cure your slave and testify to Your Messenger.)' Doing so after Salat As-Subh(Fajr) and before the rising of the sun. Let him submerse himself in it three times, for three days. If he is not cured in three, then five. If he is not cured in five, then seven. If he is not cured in seven, then nine. For indeed it will not remain after nine, with the permission of Allah."  

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا أَصَابَ أَحَدَكُمُ الْحُمَّى فَإِنَّ الْحُمَّى قِطْعَةٌ مِنَ النَّارِ فَلْيُطْفِئْهَا عَنْهُ بِالْمَاءِ فَلْيَسْتَنْقِعْ نَهْرًا جَارِيًا لِيَسْتَقْبِلَ جَرْيَةَ الْمَاءِ فَيَقُولُ بِسْمِ اللَّهِ اللَّهُمَّ اشْفِ عَبْدَكَ وَصَدِّقْ رَسُولَكَ بَعْدَ صَلاَةِ الصُّبْحِ قَبْلَ طُلُوعِ الشَّمْسِ فَلْيَغْتَمِسْ فِيهِ ثَلاَثَ غَمَسَاتٍ ثَلاَثَةَ أَيَّامٍ فَإِنْ لَمْ يَبْرَأْ فِي ثَلاَثٍ فَخَمْسٌ وَإِنْ لَمْ يَبْرَأْ فِي خَمْسٍ فَسَبْعٌ فَإِنْ لَمْ يَبْرَأْ فِي سَبْعٍ فَتِسْعٌ فَإِنَّهَا لاَ تَكَادُ تُجَاوِزُ تِسْعًا بِإِذْنِ اللَّهِ  

[Machine] The Messenger of Allah ﷺ said, "If any of you is struck with fever, let him extinguish it with cold water, pouring it three times over himself, saying, 'O Allah! Make it cool, beneficial and a means of purification from sins.' For indeed, fever is a part of the heat of Hellfire. So let him extinguish it."  

قَالَ رَسُولُ اللهِ ﷺ «إِذَا أَصَابَتْ أَحَدَكُمْ فَإِنَّ الْحُمَّى قِطْعَةٌ مِنْ نَارِ جَهَنَّمَ فَلْيُطْفِئْهَا عَنْهُ بِالْمَاءِ الْبَارِدِ جَارِيًا مُسْتَقْبِلَ جَرْيَةَ الْمَاءِ وَلْيَقُلِ اللهُمَّ صَدِّقْ رَسُولَكَ وَاشْفِ عَبْدَكَ بَعْدَ الْفَجْرِ قَبْلَ طُلُوعِ الشَّمْسِ ولْيَغْمِسْ فِيهِ ثَلَاثَ غَمَسَاتٍ فَإِنْ لَمْ يَبْرَأْ فِي خَمْسٍ فَفِي سَبْعٍ وَإِنْ لَمْ يَبْرَأْ فِي سَبْعٍ فَفِي تِسْعٍ فَإِنَّهَا لَا تَكَادُ أَنْ تُجَاوِزَ التِّسْعَ بِإِذْنِ اللهِ»  

"When one of you suffers from fever - and indeed fever is a piece of the Fire - let him extinguish it with water. Let him stand in a flowing river facing the direction of it and say: Allahummashfi 'abdaka wa saddik Rasulak ('In the name off Allah. O Allah! Cure your slave and testify to Your Messenger.)' Doing so after Salat As-Subh(Fajr) and before the rising of the sun. Let him submerse himself in it three times, for three days. If he is not cured in three, then five. If he is not cured in five, then seven. If he is not cured in seven, then nine. For indeed it will not remain after nine, with the permission of Allah." (Using translation from Tirmidhī 2084)   

"إِذَا أصاب أحدَكم الحُمَّى، فإن الحمى قطعةٌ من النار" ولفظ طب -من نارِ جهنَّمَ- فليُلطفها عنه بالماءِ- زاد طب: - البارد- فليَستْنقِعْ في نهر جار، وليَستَقْبِلْ جرِيتَهِ يقولُ: بسم اللهِ الرحمنِ الرحيم، اللَّهُمَ اشفِ عبدَك، وصدَق رسولُك، بعدَ

صلاةِ الصبح قبل طلوع الشمسِ، ولينْغَمِسْ فيه ثلاثَ غمَسات ثلاثةَ أيامٍ، فإن لم يبْرأ في ثلاث فخمسٌ، فإن لم يبرأ فسبعٌ، فإنها لا تكادُ تجاوزُ تِسْعًا بإذنِ اللهِ".