Sunan ad-Darimi

It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) gave the ruling: "A boy who is attributed to his father after his father's death (that is, after the death of the man, his heirs claim that this is the child of our deceased), the Prophet (peace and blessings be upon him) ruled that the boy is from the slave woman whom the father owned at the time of intercourse, so his lineage will be attributed to the one who claims him. However, whatever inheritance was distributed before he was attributed, he will have no share in it, but whatever inheritance has not been distributed, he will have a share in it. But if the father to whom his lineage is attributed had denied his lineage during his lifetime, then he will not be attributed to him by the claim of the heirs (that is, he will not be considered his child). And if the boy is from a slave woman whom the father did not own, or from a free woman with whom the father committed adultery, then his lineage will never be established from that man (even if the man's heirs attribute the child to him), nor will the child inherit from that (adulterer) man, even if the father claimed during his lifetime that this is my child, because he is a child of adultery, and he will be attributed to his mother's people, whether he was born from a free woman or a slave woman (after all, he is a child of adultery, and will not inherit, nor be included in the lineage)."