Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) had himself cupped; a slave of Banu Bayadah cupped him (peace and blessings be upon him), and he (peace and blessings be upon him) gave him his wage. Had it been unlawful, he (peace and blessings be upon him) would not have given it to him.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 12536