It is narrated from Sayyidah Aishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said, when the people said, "We fear that the Messenger of Allah (peace and blessings be upon him) has dhat al-janb (pleurisy)": "It is (an effect) from Satan, and Allah will not give it power over me." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it; and the opposite of this report has also been narrated from Sayyidah Aishah (may Allah be pleased with her) with a weak chain.