Musnad Ahmad 33:658

Hujayn and Yunus narrated to us, they said: Al-Layth ibn Sa'd narrated to us, from Abu al-Zubayr, from Jabir ibn Abdullah, that Umm Salamah sought permission from the Messenger of Allah, peace and blessings of Allah be upon him, for cupping. So the Messenger of Allah, peace and blessings of Allah be upon him, ordered Abu Taybah to cup her. He said: "I think he was her foster brother, or a young boy who had not yet reached puberty."