Sahih Al Bukhari – Book of Patients
Volumn 007, Book 070, Hadith Number 579.
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Narated By 'Aisha : Whenever Allah's Apostle paid a visit to a patient, or a patient was brought to him, he used to invoke Allah, saying, "Take away the disease, O the Lord of the people! Cure him as You are the One Who cures. There is no cure but Yours, a cure that leaves no disease."