It is narrated from Hazrat Thawban (may Allah be pleased with him) that the Noble 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 الأنصار رضي الله عنهم / 22430
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد حسن