“When the Messenger of Allah (ﷺ) came to a sick person, he would make supplication for him, and would say: Adhhibil-bas, Rabban-nas, washfi Antash-Shafi, la shifa’a illa shifa’uka shifa’an la yughadiru saqama (Take away the pain, O Lord of mankind, and grant healing, for You are the Healer, and there is no healing but Your healing that leaves no trace of sickness).’”
Sunan Ibn Majah Book 31, Hadith 85