Sahih Muslim Book 26, Hadith Number 5437.

Chapter : The excellence of curing the patient with the help of incantation.

‘Aisha reported: Allah’s Messenger (may peace be upon him) used to recite (this supplication) as the words of incantation: “Lord of the people, remove the trouble for in Thine Hand is the cure; none is there to relieve him (the burden of disease) but only Thou.