It is narrated from Thabit al-Bunani: When you suffer pain, place your hand where it hurts, then say: 'Bismillah, a'udhu bi-'izzatillahi wa qudratihi min sharri ma ajidu min waja'i hadha' (In the name of Allah; I seek refuge in the might of Allah and His power from the evil of what I feel from this pain of mine). Then lift your hand and repeat that an odd number of times, for Sayyiduna Anas bin Malik (may Allah be pleased with him) told me that the Messenger of Allah (peace and blessings be upon him) instructed him in this way. This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.