Narrated Abu Huraira: Allah's Apostle said, "If a man says to his brother, O Kafir (disbeliever)!' Then surely one of them is such (i.e., a Kifir). "
— Sahih Bukhari, Volume 8, Book 73: Good Manners and Form (Al-Adab), Hadith #125d
Narrated Abu Huraira: Allah's Apostle said, "If a man says to his brother, O Kafir (disbeliever)!' Then surely one of them is such (i.e., a Kifir). "
This hadith is from the book of Good Manners and Form (Al-Adab) in Sahih Bukhari, compiled by Imam al-Bukhari. It is hadith number 125d in book 73 of volume 8.
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