A’isha (RA) reported that whenever the Prophet ﷺ became sick, he would recite the Mu’awwidhāt (Sūrat Al-Falaq and Sūrat An-Nās) and then blow his breath over his body. When he became seriously ill, I used to recite (these two suwar) and rub his hands over his body hoping for its blessings. Reference: Sahih al-Bukhari 5016 .