Sahih Bukhari
Medicine
Volume: 007 / Book Number: 071 / Hadith Number: 646
Narrated 'Aisha:
The Prophet used to treat some of his wives by passing his right hand over the place of ailment and used to say, "O Lord of the people! Remove the difficulty and bring about healing as You are the Healer. There is no healing but Your Healing, a healing that will leave no ailment."