Sahih Muslim Book 26, Hadith Number 5434.

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

‘Aisha reported Allah’s Messenger (may peace be upon him) as saying: When Allah’s Messenger (may peace be upon him) visited the sick he would say: Lord of the people, remove the disease, cure him, for Thou art the great Curer, there is no cure but through Thine healing Power, which leaves nothing of the disease.