The Mother of the Believers Sayyidah Aishah (may Allah be pleased with her) said: Utbah bin Abi Waqqas instructed his brother Sa'd bin Abi Waqqas (may Allah be pleased with him) to take the son of Zam'ah's slave-girl. Utbah said that he was his son. When the Prophet (peace and blessings be upon him) came at the time of the Conquest of Makkah, Sa'd (may Allah be pleased with him) took the son of Zam'ah's slave-girl and brought him to the Prophet (peace and blessings be upon him). Abd bin Zam'ah (may Allah be pleased with him) came as well. Sa'd (may Allah be pleased with him) said: "O Messenger of Allah! He is my brother's son; he instructed me that this is his son." Abd bin Zam'ah (may Allah be pleased with him) said: "O Messenger of Allah (peace and blessings be upon him)! This is my brother, the son of Zam'ah, and he was born on his bed." The Prophet (peace and blessings be upon him) looked at the son of Zam'ah's slave-girl, and he resembled Utbah bin Abi Waqqas. The Prophet (peace and blessings be upon him) said: "He stays with you, O Abd bin Zam'ah, because he was born on his father's bed." Then the Prophet (peace and blessings be upon him) said: "O Sawdah bint Zam'ah! Observe hijab from him." (This was said) because of his resemblance to Utbah bin Abi Waqqas. And Sawdah bint Zam'ah (may Allah be pleased with her) was the wife of the Prophet (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الإقرار / 11463