Model Behavior of the Prophet (Kitab Al-Sunnah)
42/16. Chapter:
Proof Of Increase And Decrease Of Faith
Sunan Abi Dawud
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 (May peace be upon him) 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 4687In-book reference : Book 42, Hadith 92English translation : Book 41, Hadith 4670