4689Abu DawoodSahih (Al-Albani)حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ فُضَيْلِ بْنِ غَزْوَانَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم أَيُّمَا رَجُلٍ مُسْلِمٍ أَكْفَرَ رَجُلاً مُسْلِمًا فَإِنْ كَانَ كَافِرًا وَإِلاَّ كَانَ هُوَ الْكَافِرَ " Ibn "Umar reported the Messenger of Allah (ﷺ) as saying :If any believing man calls another believing man an unbeliever, if he is actually an infidel, it is all right ; if not, he will become an infidel.Reference: Sunan Abi Dawud 4687 In-book : Book 42, Hadith 92 English translation : Book 41, Hadith 4670