Medicine

Bukhari :: Book 7 :: Volume 71 :: Hadith 631

Narrated 'Aisha:

During the Prophet's fatal illness, he used to recite the Mu'auwidhat (Surat An-Nas and Surat Al-Falaq) and then blow his breath over his body. When his illness was aggravated, I used to recite those two Suras and blow my breath over him and make him rub his body with his own hand for its blessings." (Ma'mar asked Az-Zuhri: How did the Prophet use to blow? Az-Zuhri said: He used to blow on his hands and then passed them over his face.)

Source materials are from the University of Southern California MSA site
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