(205) بَابُ مَنْ قَالَ لأَخِيهِ: يَا كَافِرُ
'Abdullah ibn 'Umar reported that the Messenger of Allah, may Allahbless him and grant him peace, said, "If a man says to his brother, 'Youare an unbeliever,' it is true for one or the other of them." (ID)
Reference (ID): Al-Adab Al-Mufrad 439 (ID)
In-book reference (ID): Book 24, Hadith 21 (ID)
English translation (ID): Book 24, Hadith 439 (ID)