Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:16710a
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السيوطي:١٦٧١٠a

"كُفْرٌ بِامْرِئٍ ادِّعَاءُ نَسَبٍ لَا يَعْرِفُهُ أَوْ جَحْدُهُ وَإِنْ دَقَّ".  

[هـ] ابن ماجة [طس] الطبرانى في الأوسط عن عمرو بن شعيب عن أَبيه عن جده

See similar narrations below:

Collected by Ibn Mājah, Suyūṭī
ibnmajah:2744Muḥammad b. Yaḥyá > ʿAbd al-ʿAzīz b. ʿAbdullāh > Sulaymān b. Bilāl > Yaḥyá b. Saʿīd > ʿAmr b. Shuʿayb from his father from his grandfather

“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.”*  

ابن ماجة:٢٧٤٤حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللَّهِ حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ النَّبِيَّ ﷺ قَالَ كُفْرٌ بِامْرِئٍ ادِّعَاءُ نَسَبٍ لاَ يَعْرِفُهُ أَوْ جَحْدُهُ وَإِنْ دَقَّ