It was narrated from Abu Qilabah that when Shaddad bin Aws was walking with the Messenger of Allah P.B.U.H in Al·Baqi', he passed by a man who was being cupped, after eighteen days of the month (of Ramadan) had passed. The Messenger of Allah P.B.U.H said: "The cupper and the one for whom cupping is done both break their fast." (Sahih)