Malik reported,

Urwa bin Zubayr used to say concerning the child of a woman condemned by mutual imprecation and the child born of fornication that when such a child dies, his mother inherits her share as fixed in the Book of Allah عز وجل, and his maternal brothers inherit their shares, and the remainder goes to the former masters of his mother, if she was a freed slave woman. But if she was of Arab descent, she inherits her share, his maternal brothers inherit their shares, and whatever remains belongs to the Muslims.

Malik 1136

Sahih

حدثني يحيى

عن مالك، أنه بلغه

أن عروة بن الزبير كان يقول في ولد الملاعنة، وولد الزنى: إنه إذا مات، ورثته أمه حقها في كتاب الله عز وجل، وإخوته لأمه حقوقهم، ويرث البقية موالي أمه إن كانت مولاة. وإن كانت عربية؛ ورثت حقها، وورث إخوته لأمه حقوقهم، وكان ما بقي للمسلمين.

مالك 1136صحيح
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Reference
Commentary
Ayat
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Muwatta Malik
Book
Obligatory duties
Numbering
Laithi 1136
Malik 1136