Lady Aisha Siddiqa (may Allah be pleased with her) narrates: When the Prophet Muhammad (peace be upon him) would visit a sick person or when a sick person was brought to him, he (peace be upon him) would recite (for healing): "Remove the illness, O Lord of the people, grant healing, You are the only Healer, there is no healing except Your healing, grant such a healing that leaves no trace of illness."
Hadith Referenceصحیح ابن حبان / كتاب الجنائز وما يتعلق بها مقدما أو مؤخرا / 2971
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح: ق - المصدر نفسه.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح