The Book on Salutations and Greetings (Kitab As-Salam)
Muslim :: Book 26 : Hadith 5440
'A'isha reported that when Allah's Messenger (may peace be upon him) fell ill, he recited over his body Mu'awwidhatan and blew over him and when his sickness was aggravated I used to recite over him and rub him with his band with the hope that it was more blessed.