In his Sahih, Imam Muslim recorded on the authority of 'Uqbah bin 'Amir that the Muhammad said, "Do you not see that there have been Ayaat revealed to me tonight the like of which has not been seen before?"
Narrated 'Aisha: "Whenever Allah's Apostle became sick, he would recite al-Mu'awwidhatayn (Sūrat al-Falaq and Sūrat an-Nas) and then blow his breath over his body.