Hadith: Nay, I saw him in the Fire because of a mantle – or a cloak – that he had taken without right (from the war spoils)

عن عمر بن الخطاب رضي الله عنه مرفوعاً: لما كان يوم خيبر أقبل نَفَرٌ من أصحاب النبي -صلى الله عليه و سلم- فقالوا: فلان شهيد وفلان شهيد. حتى مَرُّوا على رجل فقالوا: فلان شهيد. فقال النبي صلى الله عليه وسلم : "كلا إني رَأَيْتُهُ في النار في بُرْدَةٍ غَلَّهَا أو عباءة".
[صحيح] - [رواه مسلم]

‘Umar ibn al-Khattāb (may Allah be pleased with him) reported: "On the Day (of the battle) of Khaybar, some of the Companions of the Prophet (may Allah's peace and blessings be upon him) came and remarked: So-and-so is a martyr and so-and-so is a martyr. When they came to a man and said: So-and-so is a martyr, the Prophet (may Allah's peace and blessings be upon him) said: "Nay, I saw him in the Fire because of a mantle – or a cloak – that he had taken without right (from the war spoils)."
Sahih/Authentic. - [Muslim]

Explanation

‘Umar ibn al-Khattāb (may Allah be pleased with him) reported that on the Day of the battle of Khaybar, some of the Companions of the Prophet (may Allah's peace and blessings be upon him) came saying: So-and-so is a martyr and so-and-so is a martyr. When they came to a man about whom they said: So-and-so is a martyr, the Prophet (may Allah's peace and blessings be upon him) remarked: Nay. I saw him in the Fire because of a cloak (from the war spoils) that he had concealed for himself. Thus, he was punished for it in Hellfire and this great attribute of martyrdom in the cause of Allah was negated from him.