Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 714
Narrated 'Aisha:
Whenever Allah's Apostle became ill, he used to recite Al-Muawidhatan (i.e. the last two Suras of the Qur'an) and then blow his breath and passed his hand over himself. When he had his fatal illness, I started reciting Al-Muawidhatan and blowing my breath over him as he used to do, and then I rubbed the hand of the Prophet over his body.