It wasnarrated from Anas bin Malik that the Messenger of Allah (ﷺ)said:
"Whoever wants to be cupped, let him seek out the seventeenth,nineteenth or twenty-first (of the month); and let none of you allowhis blood to rage so that it kills him."
English reference: Vol. 4, Book 31, Hadith 3486
Arabic reference: Book 31, Hadith 3615