It was narrated that Ibn 'Abbas (رضي الله عنه) said.

The Messenger of Allah was treated with cupping in the veins at the side of the neck and between his shoulders. He was treated with cupping by a slave of Banu Bayadah, whose fee was one and a half mudds, then he spoke to his masters and they waived half a nudd from him. Ibn ‘Abbas (رضي الله عنه) said: And he gave him his fee; if it were haram he would not have given it to him.