(14) باب فَضْلِ الْمُعَوِّذَاتِ
Narrated `Aisha:
Whenever Allah's Messenger (ﷺ) became sick, he would recite Mu'awwidhat (Surat Al-Falaq and Surat An- Nas) and then blow his breath over his body. When he became seriously ill, I used to recite (these two Suras) and rub his hands over his body hoping for its blessings.
Reference: Sahih al-Bukhari 5016
In-book reference: Book 66, Hadith 38
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 6, Book 61, Hadith 535