Musnad Ahmad 284:29

'Abd al-Razzaq narrated to us, he said: Sufyan informed us, from Mansur, from Mujahid, from Ibn al-Zubayr, that Zam'ah had a slave woman, and he used to have intercourse with her, and they used to suspect her, then she gave birth. The Prophet, peace and blessings of Allah be upon him, said to Sawdah: "As for the inheritance, it is for him, but as for you, veil yourself from him, O Sawdah, for he is not a brother to you."