Sahih Muslim
The Book on Salutations and Greetings (Kitab As-Salam)
Book Number: 026 / Hadith Number: 5441
This hadith has been narrated through some other chains of transmitters but with a slight variation of wording. In the hadith transmitted on the authority of Yanus and Ziyari (the words are):" When Allah's Apostle (may peace be upon him) fell ill, he blew over his body by reciting Mu'awwidhatan and rubbed him with his hand.