Mustawrid bin al-Ahnaf narrates: A man came to Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) and said: "My paternal uncle married me to his slave-girl, and she has borne children to me, and now he wants to make them slaves." Sayyiduna Abdullah (may Allah be pleased with him) said: "He has no such right."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9171