Sahih Al Bukhari Hadith Number 1940

Narrated Thabit Al-Bunani: Anas bin Malik was asked whether they disliked the cupping for a fasting person. He replied in the negative and said, “Only if it causes weakness.”

30  Fasting
Hadith number 1940
Volume no 3
Chapter: 32 (Cupping and vomiting in Saum (fast)