Musannaf Ibn Abi Shayba 13:3132

Abu Bakr narrated to us, he said: Abbad bin al-Awwam narrated to us, from Yahya bin Sa'id Abu Hayyan al-Taymi, from his father, that a neighbor of Shurayh entered upon him with a slave girl. She said, "O Abu Umayyah, I have emancipated this slave girl of mine." He said, "I have heard what you are saying." She said, "And I have stipulated upon her my service as long as I am alive." Shurayh said, "Here she is; if she wishes, she may do so."