Sunan Ibn Majah, Chapter: The Chapters on Medicine

that, for fever and all kinds of pain, the Prophet (saw) used to teach them to say: "Bismillahil-kabir, a'udhu billahil-'Azim min sharri 'irqin na'ar wa, min sharri harrin- nar (In the Name of Allah the Great, I seek refuge with Allah the Almighty from the evil of a vein gushing (with blood) and the evil of the heat of the Fire." (One of the narrators) Abu 'Ammar said: "I differed with the people on this, I said: 'Screaming.'" Another chain from Ibn 'Abbas, from the Prophet (saw) with similar wording, and he said: "From the evil of a vein screaming (with blood)."