It is narrated from Sayyiduna Shaddad bin Aws (may Allah be pleased with him); he said: I was walking with the Messenger of Allah (peace and blessings be upon him) in one of the streets of Madinah, and he (peace and blessings be upon him) was holding my hand, when he (peace and blessings be upon him) saw a man being cupped in Ramadan, and he said: "The one who cups and the one who is cupped have both broken their fast."
Hadith Referenceالمعجم الكبير للطبراني / باب الشين / 7101