Ata' bin al-Sa'ib (may Allah have mercy on him) said: A group of the people of Basrah - among them al-Hasan bin Abi al-Hasan - testified before me about Sayyiduna Ma'qil bin Sinan al-Ashja'i (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) passed by me while I was being cupped on the eighteenth of Ramadan, and he (peace and blessings be upon him) said: "The one who cups and the one who is cupped have both broken their fast."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17681