Al-Adab Al-Mufrad
Al-Adab Al-Mufrad 433
وَبِالسَّنَدِ، عَنْ أَبِي ذَرٍّ، سَمِعَ النَّبِيَّ صلى الله عليه وسلم يَقُولُ: مَنِ ادَّعَى لِغَيْرِ أَبِيهِ وَهُوَ يَعْلَمُ فَقَدْ كَفَرَ، وَمَنِ ادَّعَى قَوْمًا لَيْسَ هُوَ مِنْهُمْ فَلْيَتَبَوَّأْ مَقْعَدَهُ مِنَ النَّارِ، وَمَنْ دَعَا رَجُلاً بِالْكُفْرِ، أَوْ قَالَ: عَدُوُّ اللهِ، وَلَيْسَ كَذَلِكَ إِلا حَارَتْ عَلَيْهِ.
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
And with the chain, from Abu Dharr, who heard the Prophet (may Allah bless him and grant him peace) say: Whoever knowingly claims a father other than his own has disbelieved. Whoever claims to belong to a people when he is not one of them, let him take his place in the Fire. Whoever calls a man a disbeliever—or says, ‘Enemy of Allah!’—when that is not true, it returns upon him.
Notes and open questions — unreviewed
This source begins with a connective reference to a chain (‘and with the chain’); that wording is retained rather than inventing the omitted transmitters.