Sahih Muslim Book 26, Hadith Number 5435.

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

‘Aisha reported that when Allah’s Messenger (may peace be upon him) came to visit any sick he supplicated for him and said: Lord of the people, remove the malady, cure him for Thou art a great Curer. There is no cure but through Thine healing Power which leaves no trouble, and in the narration transmitted on the authority of Abu Bakr there is a slight variation of wording.