It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) used to teach them this supplication for all kinds of pain and fever: 'Bismillahil-Kabir, na'udhu billahil-'Azimi min sharri 'irqin na''ar, wa min sharri harrin-nar' (In the name of Allah, the Great; we seek refuge in Allah, the Magnificent, from the evil of a throbbing vein and from the evil of the heat of the Fire). This hadith has a sahih (authentic) chain of narration, but the two Shaykhs did not record it.