It is narrated from Sayyiduna Ali (may Allah be pleased with him) that when the Noble Prophet (peace and blessings be upon him) would seek refuge for a sick person from illness, he would recite this supplication: "Remove the suffering, Lord of the people, grant healing, You are the Healer, there is no healing except Your healing, grant such a healing that leaves behind no illness." (O Lord of the people! Remove this distress, grant healing, You alone are the Healer, healing is only that which You grant, grant such a healing that leaves no trace of illness.)