وَعَن ابْن عَبَّاس قَالَ: حَدثنِي عمر قَالَ: لَمَّا كَانَ يَوْمَ خَيْبَرَ أَقْبَلَ نَفَرٌ مِنْ صَحَابَةِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالُوا: فُلَانٌ شَهِيدٌ وَفُلَانٌ شَهِيدٌ حَتَّى مَرُّوا عَلَى رَجُلٍ فَقَالُوا: فُلَانٌ شَهِيدٌ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «كَلَّا إِنِّي رَأَيْتُهُ فِي النَّارِ فِي بُرْدَةٍ غَلَّهَا أَوْ عَبَاءَةٍ» ثُمَّ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " يَا ابْنَ الْخَطَّابِ اذْهَبْ فَنَادِ فِي النَّاسِ: أَنَّهُ لَا يَدْخُلُ الْجَنَّةَ إِلَّا الْمُؤْمِنُونَ ثَلَاثًا " قَالَ: فَخَرَجْتُ فَنَادَيْتُ: أَلَا إِنَّهُ لَا يَدْخُلُ الْجَنَّةَ إِلَّا الْمُؤْمِنُونَ ثَلَاثًا. رَوَاهُ مُسلم

Ibn ‘Abbas said he was told by ‘Umar that on the day of Khaibar some of the Prophet’s companions came and said, So and so is a martyr and so and so is a martyr,” but when they came to a man about whom they said, "So and so is a martyr” God’s Messenger declared, "By no means, I have seen him in hell in a mantle (or cloak) which he took dishonestly.” God's Messenger then said, "Go, Ibn al-Khattab, and announce among the people three times that only the believers will enter paradise.” He said he went out and announced three times, "Only the believers will enter paradise.” Muslim transmitted it.