Sahih al-Bukhari 6104
Book 78: Good Manners and Form (Al-Adab) · Hadith 131
Hadith text
حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " أَيُّمَا رَجُلٍ قَالَ لأَخِيهِ يَا كَافِرُ. فَقَدْ بَاءَ بِهَا أَحَدُهُمَا ".
Narrated 'Abdullah bin 'Umar: Allah's Messenger (ﷺ) said, 'If anyone says to his brother, 'O misbeliever! Then surely, one of them such
Abdullah bin Umar bataate hain: Allah ke Rasool (SAW) ne farmaya, 'Agar koi apne bhai se kahe, "Aye kaafir!" to unmein se ek zaroor waisa hi hai.'
Sahih al-Bukhari 6104 · Book 78, Hadith 131