Sayyiduna Shaddad bin Aws (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) was holding my hand on the eighteenth of Ramadan 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 / 7118