Dalil

Al-Adab Al-Mufrad 433

Reviling a Muslim is deviant behaviour

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وَبِالسَّنَدِ عَنْ أَبِي ذَرٍّ

سَمِعَ النَّبِيَّ ﷺ 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

Translation

✧ He heard the Prophet ﷺ say, "Whoever claims descent from someone other than his father while he knows it has disbelieved. Whoever claims to belong to a people who are not his own, let him take his seat in the Fire. And whoever calls a man a disbeliever or says 'enemy of Allah' when he is not that, it returns upon him."

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