عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يُعَلِّمُنَا مِنَ الْحُمَّى وَالْأَوْجَاعِ بِسْمِ اللَّهِ الْكَبِيرِ أَعُوذُ بِاللَّهِ مِنْ شَرِّ عِرْقٍ نَعَّارٍ وَمِنْ شَرِّ حَرِّ النَّارِ
Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that the Noble Prophet (peace and blessings be upon him) used to instruct us to recite this supplication for fever and other bodily pains: BISMILLAHIL KABEER, A’UDHU BILLAAHI MIN SHARRI ‘IRQIN NA’AAR, WA MIN SHARRI HARRIN NAAR (In the name of Allah, the Most Great, I seek refuge with Allah from the evil of the gushing vein and from the evil of the heat of the Fire).