“It is disbelief for a man to attribute himself to someone other than his father knowingly, or to deny his connection to his father, even subtly.”*
Sunan Ibn Majah Book 23, Hadith 26
← Previous Hadith “Then the Verse of Li’an was revealed, the Messenger of Allah (ﷺ) said: ‘Any woman who attributed her child to people to whom he does not belong, then she has no relation to (the religion of) Allah, and she will never enter Paradise, and any man who rejects his child, while he recognizes him, Allah will screen Himself from him on the Day of Resurrection and disgrace him before the witnesses.’”

Sunan Ibn Majah Book 23, Hadith 25 Next Hadith → “Whoever commits adultery with a slave woman or a free woman, his child is illegitimate, and he cannot inherit from him or be inherited from (i.e., this child cannot inherit from him).”

Sunan Ibn Majah Book 23, Hadith 27