Musnad Ahmad 2151

It was narrated from Ibn 'Abbas (رضي الله عنه) that When the Messenger of Allah (ﷺ) was treated with cupping, he was treated in the two veins at the side of the neck. He called the slave of Banu Bayadah, who treated him with cupping, then he paid the cupper his see, one and a half mudds, And he spoke to his masters, and they waived half a mudd, and he had to pay them two mudds.