Musannaf Ibn Abi Shayba 9:1708

Abu Bakr narrated to us, he said: Sufyan ibn ‘Uyaynah narrated to us, from ‘Ubayd Allah ibn Abi Yazid, that he heard Ibn ‘Abbas saying: "Most people have not been commanded regarding it—meaning seeking permission—and I command my slave girl to seek permission before entering upon me."