Musannaf Ibn Abi Shayba 13:946

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Yunus, from al-Hasan, from Ibn Sirin, from Anas ibn Malik, who said: We were forbidden that a resident should sell for a bedouin, even if he were his brother through his father and his mother.