Arabic (Original)
حَدَّثَنَا عَفَّانُ حَدَّثَنَا صَخْرٌ يَعْنِي ابْنَ جُوَيْرِيَةَ حَدَّثَنَا نَافِعٌ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِذَا قَالَ الرَّجُلُ لِصَاحِبِهِ يَا كَافِرُ فَإِنَّهَا تَجِبُ عَلَى أَحَدِهِمَا فَإِنْ كَانَ الَّذِي قِيلَ لَهُ كَافِرٌ فَهُوَ كَافِرٌ وَإِلَّا رَجَعَ إِلَيْهِ مَا قَالَ.
English Translation
Affan told us: Sakhr, meaning Ibn Juwayriyah, told us: Nafi' told us: that Abdullah ibn Umar informed him: that the Messenger of Allah, peace and blessings be upon him, said: When a man says to his companion, O disbeliever, it applies to one of the two of them: if the one it was said to is indeed a disbeliever, then so be it, otherwise it returns upon the one who said it.