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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad:7019 – ʿAlī b. ʿĀṣim > al-Muthanná b. al-Ṣabbāḥ > ʿAmr b. Shuʿayb from his father from his grandfather

[Machine] The Messenger of Allah ﷺ said: Disowning lineage is a form of disbelief, even if it is out of denying or falsely claiming a lineage that is not known.  

أحمد:٧٠١٩ – حَدَّثَنَا عَلِيُّ بْنُ عَاصِمٍ عَنِ الْمُثَنَّى بْنِ الصَّبَّاحِ عَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ قَالَ

قَالَ رَسُولُ اللهِ ﷺ كُفْرٌ تَبَرُّؤٌ مِنْ نَسَبٍ وَإِنْ دَقَّ أَوِ ادِّعَاءٌ إِلَى نَسَبٍ لَا يُعْرَفُ  

See similar narrations below:

Collected by Dārimī, Suyūṭī
darimi:2903 – Muḥammad b. Yūsuf > Sufyān > al-Aʿmash > ʿAbdullāh b. Murrah > Abū Maʿmar > Abū Bakr al-Ṣiddīq

[Machine] "Claiming lineage that is not recognized is disbelief in Allah, and disavowing lineage is disbelief in Allah even if it is true."  

الدارمي:٢٩٠٣ – حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ حَدَّثَنَا سُفْيَانُ عَنْ الْأَعْمَشِ عَنْ عَبْدِ اللَّهِ بْنِ مُرَّةَ عَنْ أَبِي مَعْمَرٍ عَنْ أَبِي بَكْرٍ الصِّدِّيقِ قَالَ

«كُفْرٌ بِاللَّهِ ادِّعَاءٌ إِلَى نَسَبٍ لَا يُعْرَفُ وَكُفْرٌ بِاللَّهِ تَبَرُّؤٌ مِنْ نَسَبٍ وَإِنْ دَقَّ»