بِسْمِ اللَّهِ الْكَبِيرِ، أَعُوذُ بِاللَّهِ الْعَظِيمِ مِنْ شَرِّ كُلِّ عِرْقٍ نَعَّارٍ وَمِنْ شَرِّ حَرِّ النَّارِ
Transliteration
Bismillahil-kabiri, a'udhu billahil-'azimi min sharri kulli 'irqin na''arin wa min sharri harrin-nar
English meaning
In the name of Allah the Great, I seek refuge in Allah the Supreme from the evil of every pulsing vein and from the evil of the heat of fire.
When is it recited?
Recited for a person with fever.
Source
Tirmidhi, Tibb 29, 2075