Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: "Have cupping done on the fifteenth, seventeenth, nineteenth or twenty-first (of the month), lest the blood overwhelm you and kill you."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11030