Hadith 458:15
Muhammad ibn Yazid narrated to us, Abu al-Ala’—meaning al-Qassab—narrated to us, from Qatadah, from Abu Qilabah, from Abu Asma’, from Shaddad ibn Aws, who said: I was with the Prophet, may Allah bless him and grant him peace, in Medina. He said: And that was on the eighteenth day that had passed of Ramadan. He saw a man being cupped, so the Messenger of Allah, may Allah bless him and grant him peace, said: "The one who cups and the one who is cupped have broken their fast."
حدثنا محمد بن يزيد، حدثنا أبو العلاء يعني القصاب، عن قتادة، عن أبي قلابة، عن أبي أسماء، عن شداد بن أوس، قال: كنت مع النبي صلى الله عليه وسلم بالمدينة قال: وذاك لثمان عشرة خلون من رمضان، فأبصر رجلا يحتجم، فقال رسول الله صلى الله عليه وسلم: " أفطر الحاجم والمحجوم "