After this, we reached the seventh heaven. While here, whichever Angel we came into contact with said to me, "Perform `cupping'  and command your Ummah to do so as well."
From Bihar al-Anwar, Vol. 18, p. 326, Bab 3 - Ithbaat al-Mi`raaj wa ma`anaahu wa kayfiyyatuhu wa sifatuhu wa ma jaraa feehi wa wasf al-buraaq, Hadith 34.
 Cupping is a form of medical treatment that has been mentioned in various ahadith. For more information on Cupping, see books such as Tibb an‑Nabi, Tibb al‑A'immah. (Tr.)