Sayyidah Aishah Siddiqah (may Allah be pleased with her) narrates: When the Prophet (peace and blessings be upon him) visited a sick person, he would place his blessed hand on the spot where the person felt pain and then recite: "Bismillah, la ba's (seeking blessing through the name of Allah Almighty, no pain will remain)."
Abu Ya'la recorded it, and its narrators have been declared trustworthy (muwaththaqun).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الجنائز / 3780