From Sahih Muslim (Hadith 5710):
A'isha reported that when Allah's Messenger (ﷺ) 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
Reference: Muslim 5710