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From Abu Hurayrah (RA): The Messenger of Allah (PBUH) said: “By Him in Whose grasp is Muhammad’s soul: no one from this community—nor any Jew or Christian—who hears of me, then does not believe in that with which I have been sent, and dies in that state, will be anything but among the inhabitants of Hell.” (Sahifah Hammam bin Munabbih, no. 91)
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Ahnaf bin Qays relates: I set out to support the Messenger’s cousin. On the way, I met Abu Bakrah (RA). He asked, “Where are you headed?” I replied, “I am going to support the Messenger’s cousin.” He said, “Return, for I heard the Messenger of Allah (PBUH) say: When two Muslims confront one another with their swords, each intending to kill the other, they both reach the brink of Hell. Then, when one of them kills the other, both the killer and the slain fall into the Fire of Hell.” I submitted, “O Messenger of Allah, as for the killer, that is understood; but why the slain?” He replied, “Because he, too, was eager to kill his opponent.” (Sahih Bukhari, no. 6583)
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From Abu Hurayrah (RA): The Messenger of Allah (PBUH) said: “On Mondays and Thursdays, the gates of Paradise are opened. Then every person who does not associate anything with Allah is forgiven—except one between whom and his brother there is enmity. Concerning them it is said: Give these two respite until they are reconciled.” (Sahih Muslim, no. 4658)