Sahih Muslim 5712
صحيح مسلم#5712SahihA'isha reported:Allah's Messenger (ﷺ) 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 39:66