It is narrated on the authority of 'Umar bin Khattab that when it was the day of Khaibar a party of Companions of the Apostle (ﷺ) came there and said: So and so is a martyr, till they happened to pass by a man and said: So and so is a martyr. Upon this the Messenger of Allah (ﷺ) remarked: Nay, not so verily I have seen him in the Fire for the garment or cloak that he had stolen from the booty, Then the Messenger of Allah (ﷺ) said: Umar son of Khattab, go and announce to the people that none but the believers shall enter Paradise. He ('Umar bin Khattab) narrated: I went out and proclaimed: Verily none but the believers would enter Paradise.
Hadith Referenceصحيح مسلم / كتاب الإيمان / 114
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة ، أخرجه الترمذي في ((جامعه)) في السير، باب: ما جاء في الغلول، باختصار، قال: هذا حديث حسن صحيح غريب برقم (1574) انظر ((التحفة)) برقم (10497)»