It is narrated from Sayyiduna Shaddad (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "The one who applies cupping and the one to whom it is applied, both their fasts are broken."
Hadith Referenceمسند احمد / مسند الشاميين / 17127
Hadith Gradingحکم دارالسلام:حديث صحيح ، محمد بن جعفر سمع من أبى عروبة بعد اختلاطه ، وقد توبعا