(202) بَابُ سِبَابِ الْمُسْلِمِ فُسُوقٌ
Abu Dharr states that he heard the Prophet, may Allah bless himand grant him peace, say, "A person who knowingly claims a father otherthan his own has disbelieved. A person who claims to be from a people whenhe is not one of them will take his place in the Fire. A person who callsa man an unbeliever or says, 'Enemy of Allah,' when that is not the casewill have that come back on him."
Reference: Al-Adab Al-Mufrad 433
In-book reference: Book 24, Hadith 15
English translation: Book 24, Hadith 433