It is narrated from Urwah bin al-Zubayr (may Allah have mercy on him) that he heard Sayyidah Aishah (may Allah be pleased with her) say: Sa'd bin Abi Waqqas and Abd bin Zam'ah (may Allah be pleased with them both) brought their dispute to the Messenger of Allah (peace and blessings be upon him). Sa'd (may Allah be pleased with him) said: O Messenger of Allah! My brother Utbah gave me an instruction; he said: When you come to Makkah, find the son of Zam'ah's slave-girl and take him, for he is my son. Abd bin Zam'ah (may Allah be pleased with him) said: O Messenger of Allah! This is my brother and the son of my father's slave-girl; he was born on my father's bed. The Prophet (peace and blessings be upon him) saw that he resembled Utbah, and he (peace and blessings be upon him) said: "He stays with Abd bin Zam'ah. The child belongs to the bed. And O Sawdah (may Allah be pleased with her), observe hijab from him."
(b) In one narration the words are: "O Abd! He is your brother."
This addition is mahfuz (preserved).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الإقرار / 11464