Sayyiduna Samurah bin Jundub (may Allah be pleased with him) said: I was sitting with the Messenger of Allah (peace and blessings be upon him). He (peace and blessings be upon him) called for the cupper, who had cupping horns made of horn, and he cut a little of his flesh. A Bedouin came and said: "O Messenger of Allah! He has cut your skin." He (peace and blessings be upon him) said: "This is cupping." He asked: What is cupping? He (peace and blessings be upon him) said: "It is one of the best remedies with which people treat themselves."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19526