Al-Adab Al-Mufrad #442
Disparaging
'Abdullah ibn 'Umar reported that the Messenger of Allah, may Allah
bless him and grant him peace, said, "When someone says to another, 'Unbeliever!'
then one of them is an unbeliever. If the one to whom he says it is an
unbeliever, he has spoke the truth. If that is not the case, then the one
who said it has brought down disbelief on himself."
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About Al-Adab Al-Mufrad
This hadith is #442 from Al-Adab Al-Mufrad, in the Book of Disparaging. Al-Adab Al-Mufrad contains 1,326 hadiths across 57 books.