Musnad Abu Ya'la al-Mawsili 167:9

Abu Khaythama narrated to us, Jarir narrated to us, from Mansur, from Mujahid, from Yusuf ibn al-Zubayr, from Abdullah ibn al-Zubayr, who said: Zam'a had a slave woman whom he used to have intercourse with, and he used to suspect another man of having intercourse with her. Zam'a died while she was pregnant, and she gave birth to a boy who resembled the man whom he used to suspect. Sawda mentioned this to the Messenger of Allah (may Allah bless him and grant him peace). He said: "As for the inheritance, it is for him, but as for you, observe hijab (seclusion) from him, for he is not a brother to you."