It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that he visited a man named al-Muqanna' in his illness and said: "I will not leave until he has cupping (hijamah) done, for I heard the Messenger of Allah (peace and blessings be upon him) saying: 'Indeed, there is cure in it.'" This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it!