Narrated Abu Huraira:

We witnessed along with Allah's Apostle the Khaibar (campaign). Allah's Apostle told his companions about a man who claimed to be a Muslim, "This man is from the people of the Fire." When the battle started, the man fought very bravely and received a great number of wounds and got crippled. On that, a man from among the companions of the Prophet came and said, "O Allah's Apostle! Do you know what the man you described as of the people of the Fire has done? He has fought very bravely for Allah's Cause and he has received many wounds." The Prophet ﷺ said, "But he is indeed one of the people of the Fire." Some of the Muslims were about to have some doubt about that statement. So while the man was in that state, the pain caused by the wounds troubled him so much that he put his hand into his quiver and took out an arrow and committed suicide with it. Off went some men from among the Muslims to Allah's Apostle and said, "O Allah's Apostle! Allah has made your statement true. So-and-so has committed suicide." Allah's Apostle ﷺ said, "O Bilal! Get up and announce in public: None will enter Paradise but a believer, and Allah may support this religion (Islam) with a wicked man."

حَدَّثَنَا حِبَّانُ بْنُ مُوسَى، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا مَعْمَرٌ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ شَهِدْنَا مَعَ رَسُولِ اللَّهِ ﷺ خَيْبَرَ فَقَالَ رَسُولُ اللَّهِ ﷺ لِرَجُلٍ مِمَّنْ مَعَهُ يَدَّعِي الإِسْلاَمَ " هَذَا مِنْ أَهْلِ النَّارِ ". فَلَمَّا حَضَرَ الْقِتَالُ قَاتَلَ الرَّجُلُ مِنْ أَشَدِّ الْقِتَالِ، وَكَثُرَتْ بِهِ الْجِرَاحُ فَأَثْبَتَتْهُ، فَجَاءَ رَجُلٌ مِنْ أَصْحَابِ النَّبِيِّ ﷺ فَقَالَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ الَّذِي تَحَدَّثْتَ أَنَّهُ مِنْ أَهْلِ النَّارِ قَدْ قَاتَلَ فِي سَبِيلِ اللَّهِ مِنْ أَشَدِّ الْقِتَالِ، فَكَثُرَتْ بِهِ الْجِرَاحُ. فَقَالَ النَّبِيُّ ﷺ " أَمَا إِنَّهُ مِنْ أَهْلِ النَّارِ ". فَكَادَ بَعْضُ الْمُسْلِمِينَ يَرْتَابُ فَبَيْنَمَا هُوَ عَلَى ذَلِكَ إِذْ وَجَدَ الرَّجُلُ أَلَمَ الْجِرَاحِ فَأَهْوَى بِيَدِهِ إِلَى كِنَانَتِهِ، فَانْتَزَعَ مِنْهَا سَهْمًا فَانْتَحَرَ بِهَا، فَاشْتَدَّ رِجَالٌ مِنَ الْمُسْلِمِينَ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالُوا يَا رَسُولَ اللَّهِ صَدَّقَ اللَّهُ حَدِيثَكَ، قَدِ انْتَحَرَ فُلاَنٌ فَقَتَلَ نَفْسَهُ. فَقَالَ رَسُولُ اللَّهِ ﷺ " يَا بِلاَلُ قُمْ فَأَذِّنْ، لاَ يَدْخُلُ الْجَنَّةَ إِلاَّ مُؤْمِنٌ، وَإِنَّ اللَّهَ لَيُؤَيِّدُ هَذَا الدِّينَ بِالرَّجُلِ الْفَاجِرِ ".