Sayyiduna Shaddad bin Aws (may Allah be pleased with him) narrated: I was walking with the Messenger of Allah (peace and blessings be upon him), and he (peace and blessings be upon him) was holding my hand on the morning of the eighteenth, when he (peace and blessings be upon him) turned and saw a man being cupped, and he said: "The one who cups and the one who is cupped have both broken their fast."
Hadith Referenceالمعجم الكبير للطبراني / باب الشين / 7121