Sahih Muslim
The Book on Salutations and Greetings (Kitab As-Salam)
Book Number: 026 / Hadith Number: 5437
'A'isha 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.