Mishkat al-Masabih 4:10

She said that when the Prophet had a complaint he would blow on himself, ejecting saliva, reciting the Mu'awwidhat (See n. 1, p, 197.), and wipe himself with his hand. She said, “When he suffered from the pain of which he died, I would blow on him ejecting saliva and recite the Mu'awwidhat as he did, and would take the Prophet’s hand to wipe him.” (Bukhari and Muslim.) In a version by Muslim she said, “When one of his family was ill he would blow on him ejecting saliva and recite the Mu'awwidhat .