On the day of Khaibar, a group of the companions of the Messenger of Allah ﷺ said: So and so is a martyr, So and so is a martyr, until they passed by a man and said: So and so is a martyr. The Messenger of Allah ﷺ said: ʿNo, I saw him being dragged to Hell because of a cloak that he stole from the booty. Go out and call out to the people, “No one will enter Paradise except the believers.ʿ So I went out and called out: No one will enter Paradise except the believers.
لَمَّا كَانَ يَوْمُ خَيْبَرَ أَقْبَلَ نَفَرٌ مِنْ أَصْحَابِ رَسُولِ اللهِ ﷺ يَقُولُونَ فُلانٌ شَهِيدٌ وَفُلانٌ شَهِيدٌ حَتَّى مَرُّوا بِرَجُلٍ فَقَالُوا فُلانٌ شَهِيدٌ فَقَالَ رَسُولُ اللهِ ﷺ كَلَّا إِنِّي رَأَيْتُهُ يُجَرُّ إِلَى النَّارِ فِي عَبَاءَةٍ غَلَّهَا اخْرُجْ يَا عُمَرُ فَنَادِ فِي النَّاسِ إِنَّهُ لَا يَدْخُلُ الْجَنَّةَ إِلَّا الْمُؤْمِنُونَ فَخَرَجْتُ فَنَادَيْتُ إِنَّهُ لَا يَدْخُلُ الْجَنَّةَ إِلَّا الْمُؤْمِنُونَ