Narrated from Sayyiduna Umar bin Khattab (may Allah be pleased with him) that on the day of Khaybar, a group of the noble Companions came and said:“So-and-so is a martyr, so-and-so is a martyr.”In the meantime, they passed by another slain person and said the same about him, that he is a martyr. But the Messenger of Allah (peace and blessings be upon him) said:“Never! I saw him in the Fire because of the striped cloak or garment which he had taken dishonestly.”Then the Prophet (peace and blessings be upon him) said:“O Ibn Khattab! Go and announce among the people that only the believers will enter Paradise.”So I went out from there and made this announcement:“Beware! Only the believers will enter Paradise.”