Fasting (Kitab Al-Siyam)
Dawud :: Book 13 : Hadith 2361
Narrated Thawban:
The Prophet (peace_be_upon_him) said: A man who cupped and a man who has himself cupped broke their fast. The narrator Shayban said in his version: AbuQilabah told me that AbuAsma' ar-Rahbi told him that Thawban, the client of the Apostle of Allah (peace_be_upon_him), told him that he heard the Prophet (peace_be_upon_him) say this.