Al-Adab Al-Mufrad #435
Disparaging
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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.
Abu Dharr states that he heard the Prophet, may Allah bless him
and grant him peace, say, "A person who knowingly claims a father other
than his own has disbelieved. A person who claims to be from a people when
he is not one of them will take his place in the Fire. A person who calls
a man an unbeliever or says, 'Enemy of Allah,' when that is not the case
will have that come back on him."
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About Al-Adab Al-Mufrad
This hadith is #435 from Al-Adab Al-Mufrad, in the Book of Disparaging.