It is narrated from Sayyiduna Abdullah bin Zubair that Zam‘ah had a slave woman whom he used to have relations with. People also used to accuse this slave woman. Coincidentally, she gave birth to a child. The Prophet (peace and blessings be upon him) said to Sayyidah Sawdah: "Sawdah, he will receive inheritance, but observe veiling from him, for he is not your brother, rather he is the result of sin."
Hadith Referenceمسند احمد / مسند المدنيين رضي الله عنهم اجمعين / 16127
Hadith Gradingحکم دارالسلام:حديث صحيح دون قوله: «فإنه ليس لك بأخ» ، وهذا إسناد ضعيف، مجاهد لم يسمع من ابن الزبير، بينهما يوسف بن الزبير وهو مجهول، وأيضا لا يحتمل تفرده