Urwah narrates from Sayyidah Aishah (may Allah be pleased with her) that Abd bin Zam'ah and Sa'd (may Allah be pleased with them both) came to the Prophet (peace and blessings be upon him) with a dispute concerning the son of Zam'ah's slave woman. Sa'd (may Allah be pleased with him) said: "O Messenger of Allah (peace and blessings be upon him)! My brother instructed me that when I came to Makkah I should look for the son of Zam'ah's slave woman and take him into my custody, for he is my son." Abd bin Zam'ah (may Allah be pleased with him) said: "He is my brother, the son of my father's slave woman; he was born on my father's bed." He (peace and blessings be upon him) saw a clear resemblance to Utbah, yet he (peace and blessings be upon him) said: "O Abd bin Zam'ah! He is your brother. The child belongs to the owner of the bed. And O Sawdah (may Allah be pleased with her), veil yourself from him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللعان / 15371